Arizona Billing Reference

Medical Billing in Arizona: Payer Landscape, Medicaid & Timely Filing

Arizona’s Medicaid program — AHCCCS (pronounced “access”) — is fully managed care with no fee-for-service track. The state has a 12-month timely filing window for most commercial payers and some of the strictest prior auth requirements for specialty procedures in the Southwest. Major payers include UnitedHealthcare, Blue Cross Blue Shield of Arizona, and Mercy Care.

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Medical Billing in Arizona: The Short Version

Arizona's AHCCCS is the oldest statewide Medicaid managed care system in America — there is effectively no fee-for-service Medicaid, so every Medicaid claim runs through a contracted plan. Combine that with one of the country's fastest-growing Medicare Advantage retiree markets in Maricopa County, and Arizona practices live almost entirely inside managed care rules.

Payer Landscape

Major Payers in Arizona

Payer	Type	What Billing Teams Should Know
Blue Cross Blue Shield of Arizona	Commercial / Blue plan	Largest commercial payer statewide
UnitedHealthcare	Commercial / MA	Major MA share in Phoenix metro
Aetna / Banner\|Aetna	Commercial	Joint venture products with Banner Health carry distinct networks
Cigna	Commercial / MA	Includes Cigna Medical Group legacy presence in Phoenix
Humana	Medicare Advantage	Large retiree MA book
AHCCCS	Medicaid	All managed care; plan enrollment determines everything

Medicaid Structure

AHCCCS: Managed Care Plans

Administered by the Arizona Health Care Cost Containment System. The patient's plan assignment — not just Medicaid eligibility — determines the portal, prior-auth list, and filing rules that apply.

Plan	Notes
Mercy Care	Aetna-administered; long-standing Maricopa anchor
Banner – University Family Care	Provider-owned (Banner Health)
Arizona Complete Health (Centene)	Statewide complete care plan
UnitedHealthcare Community Plan	Statewide presence
Molina Healthcare of Arizona	Complete care entrant
Health Choice Arizona	Blue Cross Blue Shield of AZ affiliate

Filing Deadlines

Timely Filing Limits for Arizona Claims

Initial-claim windows for the payers Arizona practices bill most. Commercial limits are contract-specific — always confirm against your provider agreement and the payer's current manual.

Payer	Timely Filing Limit	Notes
AHCCCS (Arizona Medicaid)	6 months from date of service	Initial claims; clean-claim resubmissions have separate 12-month outer limit
Medicare (original)	12 months from date of service	Set by federal law; no contract variation
UnitedHealthcare (commercial)	90 days from date of service	Contract-specific; some plans allow 180
Aetna (commercial)	120 days from date of service	Contract-specific; verify provider agreement
Cigna (commercial)	90 days from date of service	Contract-specific; verify provider agreement
Humana (commercial)	90 days from date of service	Among the strictest; Medicare Advantage differs

Verified against payer publications at time of writing (July 2026). Filing limits change by contract and plan year — treat this table as a starting point, not a substitute for the payer manual. See our methodology.

AZ-Specific Rules

Arizona Billing Realities to Know

No FFS Safety Net

With no meaningful fee-for-service Medicaid, a claim misrouted to AHCCCS directly (instead of the member’s plan) simply dies. Plan identification at eligibility is everything.

Retiree MA Concentration

Sun City and Maricopa retiree density makes MA plan rules — especially prior auth and annual plan-switch churn — the dominant operational challenge.

Joint-Venture Networks

Banner|Aetna and similar JV products have narrower networks than their parent brands; verifying the specific product prevents out-of-network surprises.

Border/Seasonal Population

Winter visitors carry out-of-state plans (BlueCard) and travel MA plans, adding out-of-area billing volume most states never see.

Frequently Asked Questions

AHCCCS allows 6 months from date of service (initial claims) for initial claims, administered by the Arizona Health Care Cost Containment System. Managed care plans operating in Arizona may apply shorter contractual windows, so always verify each plan's provider manual.

Mercy Care, Banner – University Family Care, Arizona Complete Health (Centene), UnitedHealthcare Community Plan, Molina Healthcare of Arizona, Health Choice Arizona. Each plan maintains its own provider portal, prior authorization list, and claim submission rules — the patient's plan assignment, not just Medicaid status, determines how a claim must be billed.

Blue Cross Blue Shield of Arizona, UnitedHealthcare, Aetna / Banner|Aetna, Cigna, Humana, alongside Medicare and AHCCCS. See the payer landscape table on this page for what billing teams should know about each.

AHCCCS, launched in 1982, was the first statewide Medicaid managed care system — Arizona never built a traditional fee-for-service program. Every AHCCCS member belongs to a contracted health plan, so billing, prior authorization, and appeals always follow the member’s specific plan rules rather than a state FFS manual.

Code Reference

Common Codes Billed in This State

Frequently billed codes in this state’s payer environment, with notes on state-specific rules and common denial patterns.

Code	Description	State-Specific Note
99213	Office visit, est. patient — level 3	Filed to AHCCCS MCO plan, not AHCCCS directly
99214	Office visit, est. patient — level 4	Highest-volume E&M under BCBSAZ and UnitedHealthcare
99215	Office visit, est. patient — level 5	Elevated audit risk; document MDM thoroughly
T1015	Clinic visit / encounter	Required for FQHC billing under AHCCCS managed care
Mod. GT	Telehealth — real-time audio/video	Required on all AHCCCS telehealth claims; auth often needed
CO-45	Charge exceeds fee schedule / max allowable	Most common AHCCCS MCO denial; verify plan fee schedule

Codes and reimbursement rates change annually. Verify current fee schedules with each payer before billing. Full code lookup →