What does denial code CO-96 mean?

CO-96 means the service billed is not covered under the patient's benefit plan — it is a benefit exclusion, not a medical necessity denial. The service may be excellent clinical care, but the patient's plan simply does not include a benefit for it. Common exclusions: cosmetic procedures, most dental services, weight loss programs, vision care beyond basic exams, experimental procedures, and services exceeding frequency limits. CO-96 is different from CO-50 (not medically necessary): CO-50 means the service is covered but wasn't warranted; CO-96 means the benefit doesn't exist at all, regardless of clinical need.

Can I bill the patient for a CO-96 denial?

You can bill the patient for a CO-96 non-covered service only if the patient received advance written notice before the service that it might not be covered and agreed in writing to accept financial responsibility. For Medicare, this requires a valid Advance Beneficiary Notice (ABN) signed before the service. For commercial insurance, a comparable financial responsibility or non-covered service notice signed by the patient is required under most state laws and provider agreements. Without advance written notice, CO-96 is a provider write-off — you cannot shift it to the patient retroactively. Sending a CO-96 balance to collections without prior notice is a contract violation and potential regulatory issue.

What is the difference between CO-96 and CO-50?

CO-50 means the service is covered under the plan but was denied because the payer determined it was not medically necessary for this patient at this time — a clinical judgment denial that is appealable on medical necessity grounds. CO-96 means the service is not covered under the plan at all — the benefit simply does not exist in the patient's plan, regardless of medical necessity. CO-50 is always worth appealing with clinical documentation. CO-96 requires first verifying the exclusion is correctly applied — if it is, clinical documentation does not help because the denial is about the benefit design, not the clinical decision.

What is the difference between CO-96 and PR-96?

CO-96 means the non-covered service is a contractual write-off for the provider — the contract between provider and payer places the financial responsibility on the provider, not the patient. PR-96 (or PR-204) means the same type of non-covered service is patient-responsible — the patient is expected to pay for the excluded service. The group code (CO vs. PR) tells you who owes the money. CO-96 requires a write-off or advance-notice patient billing. PR-96/PR-204 allows direct patient billing without specific advance notice requirements. Always check the group code before posting adjustments.

What is an Advance Beneficiary Notice (ABN) and when is it required?

An Advance Beneficiary Notice (ABN) is a CMS-mandated form (CMS-R-131) that Medicare providers must give to Medicare beneficiaries before providing a service that Medicare may not cover, so the patient can make an informed financial decision. A valid ABN must: be issued before the service (not after), identify the specific service and reason Medicare may not cover it, include an estimated cost, offer the patient a choice (receive the service and pay, or decline), and be signed and dated by the patient. Without a valid ABN, Medicare providers cannot bill the patient for services denied under CO-96. ABNs are required any time you have reason to believe Medicare may not cover the service — not just when you know it won't.

Are mental health services ever correctly denied under CO-96?

Rarely, for most plans after 2010. The Mental Health Parity and Addiction Equity Act (MHPAEA) of 2008 and the ACA prohibit most group health plans from applying more restrictive benefit limits to mental health or substance use disorder benefits than to comparable medical/surgical benefits. If a plan covers inpatient medical care but completely excludes inpatient psychiatric care under CO-96, that exclusion likely violates MHPAEA and should be appealed citing the federal parity law. Exceptions: plans that offer no mental health benefit at all (rare after ACA), grandfathered individual market plans, and some short-term health plans not subject to ACA requirements.

CO-96 Denial Code: Non-Covered Service — Fix Guide

Q: Can a reconstructive procedure be denied under CO-96 as cosmetic?

No. Reconstructive procedures are not cosmetic and cannot be correctly denied under CO-96's cosmetic exclusion. CMS defines reconstructive surgery as surgery performed to correct or repair abnormal structures of the body caused by congenital defects, developmental abnormalities, trauma, infection, tumors, or disease. The Women's Health and Cancer Rights Act (WHCRA) requires most group health plans that cover mastectomies to also cover reconstructive surgery following mastectomy. If CO-96 is issued citing cosmetic exclusion on a procedure that is reconstructive by clinical definition, that is a misapplication and should be appealed with the treating provider's documentation of the reconstructive nature and the applicable statute or plan language.

CO-96 in plain English

CO-96 means the patient's benefit plan does not include coverage for this service — not that the service was clinically wrong, but that the benefit simply isn't there. Common examples: cosmetic procedures, most routine dental, most vision, weight loss programs, services exceeding plan frequency limits. Before writing off: verify the exclusion is correctly applied. Payers misapply exclusions — billing cosmetic when the procedure was reconstructive, dental when the service was medically necessary oral surgery, or experimental when the treatment is standard of care. If the exclusion was correctly applied, patient billing requires prior written notice.

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CO-96 vs. CO-50 — two completely different denials

CO-50 means the service is covered under the plan but the payer says it wasn't clinically necessary — appealable with clinical documentation. CO-96 means the service is not covered at all, regardless of clinical need — clinical documentation does not help here. The fix for CO-50 is an appeal with medical records. The fix for CO-96 starts with verifying the exclusion, then determining whether patient billing is possible. Using a CO-50 strategy on CO-96 wastes time.

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Do not bill the patient for CO-96 without prior written notice — it is a contract violation

If the patient did not receive written notice before the service that it might not be covered and agree to financial responsibility, CO-96 is a provider write-off. Sending a CO-96 balance to collections without prior notice violates most provider contracts and, in some states, constitutes an unfair billing practice. Issue advance notice notices at scheduling — not retroactively at billing.

Common CO-96 Exclusion Categories

What is excluded — and where payers misapply each exclusion

Verify the exclusion matches the service. The categories below show where payers incorrectly apply CO-96 most often — each misapplication is a legitimate appeal.

Exclusion Category	What Is Correctly Excluded	Common Misapplication	Appeal?
Cosmetic procedures	Procedures performed solely to improve appearance without correcting a medical condition — facelifts, elective rhinoplasty, liposuction for aesthetics, breast augmentation for size preference	Applied to reconstructive procedures: post-mastectomy breast reconstruction (WHCRA-protected), scar revision after trauma or burns, cleft palate repair, skin grafts after cancer excision. These are reconstructive by definition and cannot be correctly excluded as cosmetic.	Appeal if reconstructive
Dental / oral services	Routine dental care: cleanings, fillings, crowns, orthodontics, periodontal care — services most medical plans exclude because they expect dental plan coverage	Applied to medically necessary oral surgery: tumor resection, jaw fracture repair, oral cancer surgery, infections requiring hospital admission, dental care required before cardiac surgery or organ transplant. Federal law and most commercial contracts require coverage when oral care is medically necessary to treat a non-dental medical condition.	Appeal if medically necessary
Vision / eye care	Routine eye exams, glasses, contact lenses, refractive surgery (LASIK) for correction of vision without pathology	Applied to medical eye care: treatment of diabetic retinopathy, glaucoma management, cataract surgery, strabismus treatment, dry eye disease management, orbital trauma repair. These are medical conditions treated by ophthalmologists and are covered under the medical benefit, not the vision benefit.	Appeal if medical diagnosis
Weight loss / obesity programs	Commercial weight loss programs, meal replacements, non-prescription weight loss products, cosmetic bariatric surgery without medical indication	Applied to medically necessary obesity treatment: bariatric surgery meeting NIH criteria (BMI ≥40 or ≥35 with comorbidity), FDA-approved anti-obesity medications prescribed for metabolic disease, physician-supervised intensive behavioral therapy for obesity (covered by Medicare), treatment of obesity-related complications.	Appeal if NIH criteria met
Experimental / investigational	Treatments without sufficient peer-reviewed evidence of safety and efficacy, treatments in Phase I/II clinical trials, procedures explicitly designated experimental in the plan's coverage policy	Applied to treatments that have become standard of care since the plan's exclusion language was written, FDA-approved therapies for new indications, or procedures with strong specialty society endorsement. Payer exclusion lists lag behind clinical evidence — a service can be standard of care while still appearing on an exclusion list.	Appeal with literature
Frequency / benefit limits exceeded	Services beyond the plan's stated annual or lifetime visit or dollar limits — PT visits after 30 per year, chiropractic beyond 20 visits, etc.	Payer's visit count is wrong (counted a visit that was cancelled, denied, or applied to a different plan year), visits should apply under a different benefit category (e.g., PT counted toward a chiro limit), or the plan's stated limit was itself a violation of MHPAEA parity rules for mental health services.	Appeal with visit log
Mental health / substance use	Plans that genuinely offer no mental health benefit (rare after ACA), grandfathered plans, short-term plans not subject to ACA parity requirements	Applied to plans subject to MHPAEA where mental health benefits exist but were denied under a more restrictive limit than comparable medical/surgical benefits. Under MHPAEA, plans cannot impose more restrictive day limits, visit limits, or prior auth requirements on mental health than on comparable medical benefits.	Appeal citing MHPAEA

RARC Lookup

RARC codes paired with CO-96 — and what each signals

The RARC identifies the specific exclusion category applied. Always read it before determining whether to appeal or write off.

RARC	What It Means with CO-96	Action
N20	Service not covered by this payer/contractor — general non-coverage statement	Request the specific plan benefit document. N20 is vague — call provider services to get the exact exclusion language being cited. Verify it applies to this specific service.
N115	This decision was based on a National Coverage Determination (NCD) or Local Coverage Determination (LCD)	Find the specific NCD or LCD cited. The exclusion may be a non-coverage determination with a specific code range. Verify your procedure code falls within the non-covered range. Some LCDs have coverage gaps where certain diagnoses are not covered — confirm the diagnosis, not just the procedure.
N130	Consult plan benefit documents for coverage rules	Request the Summary of Benefits and Coverage or Evidence of Coverage. Read the exclusion section directly. N130 often accompanies CO-96 when the payer is citing a plan document exclusion rather than a regulatory or LCD-based exclusion.
N522	Benefit maximum for this time period has been reached	Pull the patient's benefit history from your system and from the payer portal. Verify the visit/unit count against the payer's records. If your count differs from theirs, request a detailed visit history and dispute the count. If the count is correct, issue advance notice and bill the patient.
N657	This claim/service is not payable under our claims jurisdiction — forward to the correct payer	This RARC with CO-96 often means wrong payer. Verify the patient's primary coverage and redirect. Check for Medicare Secondary Payer (MSP) situations where Medicare is secondary and the primary payer should have been billed first.
M32	Not covered when performed during the same session or on the same day as another service	Verify whether this is a true benefit exclusion or an NCCI bundling issue (which would be CO-97, not CO-96). If NCCI applies, the code should be CO-97 — payer may have miscoded the denial. Appeal citing the correct CARC if so.

Patient Billing

When you can — and cannot — bill the patient for CO-96

The answer depends entirely on what notice was given before the service. No notice = provider write-off, no exceptions.

✓ Can bill patient

Patient received advance written notice and signed it

Before the service, the patient received a written notice identifying the specific service, explaining that it may not be covered, providing an estimated cost, and the patient signed acknowledging financial responsibility. For Medicare: valid ABN (CMS-R-131). For commercial: comparable non-covered service notice per your state's requirements. Bill the patient directly for the non-covered charge.

✓ Can bill patient

Service is routinely non-covered and patient was verbally informed at scheduling

For services that are universally non-covered (routine dental, elective cosmetic with no clinical component, routine vision for glasses) and the patient was clearly informed at scheduling, billing is generally permissible — though written notice is always safer and required for Medicare. Document the scheduling discussion in the patient record.

✗ Cannot bill patient

No advance notice was given before the service

If no written notice was given before the service and the patient had no reasonable way to know the service was non-covered, billing the patient after the fact is a contract violation. For Medicare, it also violates CMS regulations. Write off the balance as a contractual adjustment. Going forward, issue notices at scheduling for any service that may be non-covered.

✗ Cannot bill patient

Exclusion was misapplied — appeal is the correct path

If the CO-96 was issued in error (reconstructive billed as cosmetic, medical eye care billed as vision exclusion, etc.), do not bill the patient — appeal the denial. Billing the patient while an appeal is pending is premature and creates confusion. Resolve the appeal first; if it succeeds, the claim pays. If it fails and the exclusion is confirmed correct, then determine whether notice was given for patient billing.

→ Verify first

Frequency limit exceeded — verify the count before billing

If CO-96 was issued because a visit limit was exceeded, verify the payer's count against your records before billing the patient. If the count is wrong, appeal. If the count is correct and the patient was informed at scheduling that limits were approaching, billing is permissible. Do not bill for visits that fall within the benefit limit due to a counting error.

→ Check state law

Commercial insurance — state balance billing laws vary

Many states have enacted balance billing protection laws that restrict when and how providers can bill patients for non-covered services. Some states require specific notice language and delivery methods. Verify your state's requirements before issuing any non-covered service notice — a notice that doesn't meet state requirements may not be enforceable for patient billing.

Step-by-Step Response

What to do when you see CO-96

Read the RARC and identify the specific exclusion category

Do not assume you know why CO-96 was issued. Find the RARC on the ERA and match it to the exclusion table above. N130 (plan document exclusion) and N522 (benefit limit) have different responses. If no RARC is present — which is a payer error, since CO-96 requires an accompanying remark code — call provider services to get the specific exclusion being cited.
Verify the exclusion against the patient's actual benefit document

Eligibility verification tells you the patient is enrolled; it does not tell you the specific exclusion language. Request the Summary of Benefits and Coverage (SBC) or ask the patient for their Evidence of Coverage (EOC). Read the exclusion section. Verify: (a) is this service explicitly excluded? (b) does the exclusion apply to this specific service category or is it being over-broadly applied? (c) does the exclusion have exceptions that apply here (e.g., cosmetic exclusion with a reconstructive exception)?
Check for misapplication — use the exclusion table above

Run through the 7 misapplication categories. The most common: reconstructive coded as cosmetic, medical eye care coded as routine vision, medically necessary oral surgery coded as dental, standard-of-care treatment coded as experimental. If any misapplication applies, prepare a formal Level 1 appeal citing the specific reason the exclusion does not apply and the statutory or contractual language that supports coverage.
Determine patient billing eligibility based on prior notice

Pull the patient's intake documents. Was a non-covered service notice or ABN issued before this service? Was it signed? Does it reference this specific service? If yes to all: bill the patient. If no: write off the balance as a contractual adjustment. Document your finding in the account notes — "CO-96 exclusion verified; no prior notice issued; written off per contract" or "CO-96; ABN on file dated [date]; patient billed."
Post the write-off or patient bill, and update your intake process

Post the CO-96 as a contractual adjustment (not bad debt or write-off for bad debt reporting). If the service is one you routinely provide that is frequently excluded by certain plans, update your scheduling intake: add a benefit verification step that checks for this specific exclusion and triggers a non-covered service notice at scheduling for future patients on those plans.

Prevention

How to prevent CO-96 surprises — and protect your right to bill the patient

Verify benefits beyond eligibility — specifically check for exclusions on your high-risk service types. Eligibility confirmation tells you the patient is insured; it does not tell you what is excluded. For any service your practice provides that is sometimes excluded (PT beyond visit limits, weight management, certain procedures on some plans), add an explicit exclusion check to your benefit verification workflow.
Issue non-covered service notices at scheduling, not at billing. The advance notice must precede the service. A notice issued the day before billing (after the service was already rendered) does not establish valid patient financial responsibility in most states. Build the notice into your scheduling workflow for any service with a known exclusion risk.
For Medicare patients, issue an ABN whenever there is reason to believe Medicare may not cover the service. "Reason to believe" is a broad standard — if you've seen CO-96 on this service type before for Medicare patients, that establishes reason to believe. Keep signed ABNs on file and attach the ABN indicator (GA modifier) to the claim to signal to Medicare that an ABN was issued.
Track CO-96 by payer and service type monthly — identify which payers exclude which of your services. Build a payer-exclusion matrix for your practice's top 20 procedure codes. When you identify a pattern (e.g., Humana MA excludes CPT XXXXX for commercial plan type Y), add that exclusion to your benefit verification and notice workflow so it is caught at scheduling for every future patient on that plan type.
Document reconstructive intent clearly in the operative or clinical note — cosmetic misapplication is the most common and easiest-to-prevent CO-96 error. For any procedure that could superficially appear cosmetic, the treating physician's documentation must clearly state the medical or reconstructive indication: the condition being corrected, its etiology (trauma, cancer, congenital defect), and the functional impairment being addressed. Ambiguous notes that don't state the reconstructive purpose invite CO-96.

Appeal Template

CO-96 appeal — cosmetic exclusion misapplied to reconstructive procedure

Replace [bracketed fields] with your specifics. Adapt the statute cited to match your specific misapplication type.

VIA: Formal Claims Appeal — Level 1

Date: [Date]

Payer: [Payer Name] | Claim Number: [Claim #]

Member ID: [Member ID] | Provider NPI: [NPI]

Date of Service: [DOS] | Procedure: [CPT Code and Description]

Denial Code: CO-96 | RARC: [RARC]

RE: Appeal of CO-96 — Exclusion Misapplied / Service Is Covered

We are appealing the CO-96 denial of CPT [Code] as non-covered. The denial incorrectly classifies this procedure as [cosmetic / dental / vision / experimental / other exclusion category]. The service rendered was not within the excluded category and is a covered benefit under the patient's plan.

Clinical Basis — Service Is Reconstructive / Medically Necessary, Not [Excluded Category]

The treating provider's documentation dated [date] establishes that: [Describe: the medical condition, its cause (trauma / cancer / congenital defect / disease), and the functional impairment being corrected. Be specific — quote the clinical note where possible.]

By definition, this procedure is [reconstructive / medically necessary oral surgery / medically necessary eye care / standard of care], not [cosmetic / routine dental / routine vision / experimental].

Applicable Statute / Plan Language

[Select as applicable:]
— Women's Health and Cancer Rights Act (WHCRA): requires coverage of post-mastectomy reconstruction on plans that cover mastectomy.
— Mental Health Parity and Addiction Equity Act (MHPAEA): prohibits more restrictive mental health limits than comparable medical/surgical benefits.
— Plan's own Evidence of Coverage, Section [X], which defines the cosmetic exclusion as limited to procedures performed solely for appearance and explicitly excludes reconstructive procedures from the cosmetic exclusion.
— ACA Section 2713: requires coverage of preventive services without cost-sharing for non-grandfathered plans.

We request that this claim be reprocessed as a covered service and paid at the contracted rate. Supporting documentation enclosed: [list: treating provider's note, operative report, relevant diagnostic records].

Sincerely, [Practice Administrator], [Practice Name] | Contact: [Name, Phone]

Frequently Asked Questions: CO-96

CO-96 means the service billed is not covered under the patient's benefit plan — it is a benefit exclusion, not a medical necessity denial. The clinical care may have been completely appropriate, but the patient's plan doesn't include a benefit for this type of service. Common exclusions: cosmetic procedures, routine dental, routine vision, weight loss programs, services exceeding plan frequency limits. Always verify the exclusion is correctly applied before writing off — payers misapply exclusion categories regularly, and a reconstructive procedure coded as cosmetic, or medical eye care coded as routine vision, is an appeal worth filing.

Only if the patient received advance written notice before the service that it might not be covered and agreed in writing to financial responsibility. For Medicare, this requires a valid signed ABN (CMS-R-131). For commercial, a comparable non-covered service notice signed before the service. Without advance notice, CO-96 is a provider write-off that cannot be shifted to the patient retroactively. Sending a CO-96 balance to collections without prior notice is a contract violation and potential regulatory violation in many states.

CO-50 means the service is covered under the plan but the payer determined it wasn't medically necessary for this patient — a clinical judgment appealable with medical documentation. CO-96 means the service isn't covered at all regardless of clinical need — submitting clinical notes won't help because the denial is about the benefit design, not the clinical decision. Use CO-50 strategy (medical necessity appeal) only for CO-50. Use CO-96 strategy (exclusion verification, patient notice, appeal for misapplication) for CO-96.

An ABN (form CMS-R-131) is a written notice Medicare providers must give beneficiaries before providing a service that Medicare may not cover, so the patient can decide whether to proceed knowing they may be financially responsible. A valid ABN must: be issued before the service, name the specific service, explain why Medicare may not cover it, include a cost estimate, give the patient a choice, and be signed and dated by the patient. Without a valid ABN, Medicare providers cannot bill the patient for CO-96 denials. ABNs are required whenever you have reason to believe Medicare may not cover the service.

No. Reconstructive procedures are not cosmetic by definition. CMS defines reconstructive surgery as surgery to correct or repair abnormal structures caused by congenital defects, developmental abnormalities, trauma, infection, tumors, or disease. The Women's Health and Cancer Rights Act (WHCRA) requires most group health plans that cover mastectomies to also cover reconstructive surgery. CO-96 on a reconstructive procedure citing a cosmetic exclusion is a misapplication — appeal with clinical documentation establishing the reconstructive nature and the applicable statute or plan exception language.

Rarely, for ACA-compliant plans. The Mental Health Parity and Addiction Equity Act (MHPAEA) prohibits most group health plans from applying more restrictive limits on mental health or substance use disorder benefits than on comparable medical/surgical benefits. A plan that covers inpatient medical care but excludes inpatient psychiatric care under CO-96 likely violates MHPAEA. Appeal citing MHPAEA and requesting parity analysis. Plans not subject to MHPAEA (certain grandfathered plans, short-term health plans, some church plans) may validly exclude mental health benefits — verify plan type before filing a parity-based appeal.

The group code (CO vs. PR) tells you who owes the money for the non-covered service. CO-96 means the non-covered service is a contractual obligation for the provider — the provider absorbs it or bills the patient only with prior notice. PR-96 or PR-204 means patient responsibility — the patient owes the non-covered charge and can be billed directly without specific advance notice requirements (though good practice always involves informing patients at scheduling). When you see CO-96, check whether it should have been PR — some payers incorrectly assign the CO group to services that are patient-responsible non-covered charges.

Related Codes

Non-Covered Charge — Service Excluded from Patient's Benefit Plan