Anthem Blue Cross Blue Shield Medical Billing Guide

Overview of Anthem Blue Cross Blue Shield Billing

Anthem Blue Cross Blue Shield is the largest for-profit managed care company in the Blue Cross Blue Shield Association, covering approximately 46 million members across 14 states. The company operates under various names including Anthem Blue Cross in California, Empire BlueCross BlueShield in New York, and Anthem BCBS in Indiana, Ohio, and several other states. Each state operation maintains slightly different billing rules, fee schedules, and prior authorization requirements.

Billing with Anthem requires attention to the specific state plan your patient carries. A patient with an Anthem BCBS of Georgia plan has different coverage rules than one with Anthem Blue Cross of California. Your front desk team should capture the full plan name and group number during registration, not just “Anthem” or “Blue Cross.” This single step prevents a significant number of eligibility-related denials.

Timely Filing Requirements by Plan Type

Anthem BCBS commercial plans generally allow 180 days from the date of service for claim submission, both for in-network and out-of-network providers. This is more generous than UnitedHealthcare’s 90-day window but still requires disciplined claim submission workflows. Medicare Advantage plans through Anthem follow the standard 365-day Medicare filing deadline.

Corrected claims carry a separate deadline of 180 days from the date of the original remittance advice. When submitting corrected claims, use frequency code 7 in loop 2300, segment CLM05-3 of the 837 file. Always reference the original claim number in the remarks field. Anthem’s system matches corrected claims to originals using the member ID, date of service, and procedure code.

For states with mandated filing deadlines that exceed Anthem’s contractual terms, the state law takes precedence. Providers in states like New York, which mandates a longer filing window for certain situations, can cite the state regulation when disputing timely filing denials. Keep records of your state’s prompt pay and clean claim statutes as backup.

Electronic Submission and Clearinghouse Setup

Anthem’s preferred electronic submission portal is Availity, which offers free claim submission, eligibility verification, and authorization management. Creating an Availity account is free for providers, and the platform connects to all Anthem state plans through a single interface. For batch claim submission, Anthem accepts 837P and 837I files through Availity’s EDI gateway or any approved clearinghouse.

The electronic payer ID varies by state operation. Common payer IDs include 47198 (Anthem Blue Cross California), 47171 (Anthem BCBS Indiana), 47189 (Anthem BCBS Ohio), and 36273 (Empire BCBS New York). Using the wrong payer ID is a common source of rejected claims, especially for practices that see patients from multiple states. Verify the payer ID with your clearinghouse before the first submission for each state plan.

Anthem processes clean electronic claims within 15 to 20 business days. Paper claims take 30 to 45 business days. The difference in processing time alone justifies the setup effort for electronic submission. Claims that require manual review (those flagged for medical review or coordination of benefits) may take an additional 15 to 30 days regardless of submission method.

Prior Authorization and Referral Management

Anthem maintains separate prior authorization lists for each state plan and product type (HMO, PPO, EPO). The general categories requiring prior auth include advanced imaging (MRI, CT, PET scans), elective inpatient admissions, outpatient surgeries at ambulatory surgery centers, specialty medications, durable medical equipment over $500, and genetic testing. Some behavioral health services also require authorization depending on the plan.

Submit prior authorization requests through the Availity portal for the fastest turnaround. Anthem processes standard (non-urgent) prior auth requests within 5 to 10 business days. Urgent requests receive a decision within 24 to 72 hours. For truly emergent situations, Anthem allows retrospective authorization within 48 hours of the service.

When prior auth is denied, you receive the denial in writing with the clinical rationale. Peer-to-peer reviews are available if your physician wants to discuss the case with the Anthem medical director. Request the peer-to-peer within 5 business days of the denial for best results. These conversations overturn approximately 30% of initial prior auth denials when the treating physician presents a strong clinical case.

Denial Management and Appeal Process

Anthem’s overall denial rate averages 12% to 16% depending on the provider type and specialty. The most common denial categories are prior authorization failures (25%), coding errors (20%), eligibility issues (15%), timely filing (10%), and medical necessity disputes (10%). The remaining 20% covers coordination of benefits, bundling edits, and miscellaneous administrative reasons.

First-level appeals must be filed within 180 days of the adverse determination. For clinical denials, include the complete medical record for the date of service, a letter of medical necessity from the treating provider, and any relevant clinical guidelines or peer-reviewed literature supporting the treatment. Anthem processes first-level appeals within 30 calendar days for post-service claims.

Second-level appeals follow if the first level is unsuccessful. Anthem allows 60 days from the first-level decision to file the second level. A different medical reviewer conducts the second-level review. If both internal levels are exhausted, external review is available through the state Department of Insurance in the member’s state of residence.

Modifier Guidelines and Coding Considerations

Anthem follows CMS NCCI bundling edits with some proprietary additions. Modifier 25 is accepted for significant, separately identifiable E/M services, but Anthem audits patterns where modifier 25 is used on more than 30% of minor procedure claims. Keep your modifier 25 usage below that threshold or be prepared to supply documentation for audited claims.

For telehealth services, Anthem requires place of service 02 or 10 and accepts modifier 95 for synchronous audio-video visits. Audio-only coverage varies by state and plan type. California plans offer broader telehealth coverage than some eastern state plans. Always verify the specific telehealth policy for the patient’s state plan before billing.

Anthem uses Cotiviti (formerly HMS) for claims editing and prepayment review. Claims that trigger Cotiviti edits are held for additional review, which can add 15 to 30 days to processing time. Common triggers include high-complexity E/M codes billed with same-day procedures, multiple physical therapy units in a single visit, and bilateral procedure claims without appropriate modifiers.