As the U.S. Healthcare system continues its shift toward comprehensive, whole-person care, the Centers for Medicare & Medicaid Services (CMS) is expanding payment models to better support integrated primary and behavioral health services. In 2026, CMS introduced fresh behavioral health integration (BHI) and psychiatric collaborative care management (CoCM) add-on codes designed to strengthen the Advanced Primary Care Management (APCM) model launched in 2025.
This month’s FWA Insights highlights what special investigation units (SIUs) should realize about the new add-on codes, how they differ from previous requirements, and the potential vulnerabilities to errors, upcoding, and fraud that health plans may encounter as providers adapt to the updated billing structure.
The CMS Innovation Center supports the development and testing of innovative health care payment and service delivery models, including those aimed at improving access to behavioral health services within primary care settings. These efforts are part of broader initiatives to modernize the nation’s digital health ecosystem and empower patients with better health outcomes.
Medicare Part B (Medical Insurance) may pay providers to aid manage care for behavioral health conditions such as depression, anxiety, or other mental health conditions through behavioral health integration services. After the Part B deductible, beneficiaries pay 20% of the Medicare-approved amount for these services, which are typically offered on a monthly basis under an agreement between the patient and provider.
The Psychiatric Collaborative Care Model is a set of integrated behavioral health services that includes care planning for behavioral health conditions, ongoing assessment of the patient’s condition, medication support, counseling, and other treatments recommended by the provider. This model is designed to improve care quality and reduce costs for individuals with behavioral health needs, particularly those who are dually eligible for Medicare and Medicaid.
People who are eligible for both Medicare and Medicaid, also known as dually eligible enrollees, often have significant health and social needs, making them among the nation’s highest-need, highest-cost populations. Advancing integrated financing and delivery systems for these individuals is a focus of efforts to improve beneficiary and family experience of care, increase care quality, and reduce costs.
Understanding the New BHI and CoCM Add-On Codes for APCM
The Advanced Primary Care Management (APCM) model, launched by CMS in 2025, provides a comprehensive monthly payment for primary care services that go beyond traditional fee-for-service billing. In 2026, CMS added behavioral health integration (BHI) and psychiatric collaborative care management (CoCM) as add-on services to the APCM model to further support whole-person care approaches.
These add-on codes allow primary care providers to receive additional reimbursement when they deliver structured behavioral health services as part of APCM, such as care coordination, patient engagement, and ongoing monitoring of mental health conditions. The goal is to reduce fragmentation between physical and behavioral health care, especially for patients with chronic conditions.
Unlike standalone BHI or CoCM services billed under traditional Medicare Part B, the APCM add-on codes are designed to be billed only in conjunction with an active APCM service period. This ensures that behavioral health integration occurs within the context of ongoing, comprehensive primary care management rather than as isolated interventions.
Key Differences from Previous Behavioral Health Billing Requirements
Prior to 2026, behavioral health integration services under Medicare were primarily billed using standalone CPT codes such as 99484 (general behavioral health integration) or 99492–99494 (Psychiatric Collaborative Care Management). These services required specific documentation, including a signed patient agreement, initial assessment, and monthly care plan updates, but were not tied to a broader primary care management framework.
The new APCM-linked add-on codes change this dynamic by embedding behavioral health services within a capitated primary care payment model. Providers must now attest that the patient is enrolled in APCM for the month in which the add-on code is billed, and that the behavioral health services meet the core components of either BHI or CoCM as defined by CMS.
This shift aims to reduce administrative burden by consolidating payments while encouraging closer collaboration between primary care teams and behavioral health specialists. However, it also introduces new compliance considerations, particularly around verifying eligibility and preventing duplicate billing for similar services.
Potential Vulnerabilities to Errors, Upcoding, and Fraud
As providers adapt to the updated billing structure, special investigation units (SIUs) should be aware of several potential vulnerabilities. One risk involves incorrect attribution of behavioral health services to the APCM add-on codes when the patient is not actually enrolled in an active APCM service period for that month.
Another concern is the potential for upcoding, where providers bill for a higher-level CoCM add-on code (e.g., 99493 or 99494) when only general behavioral health integration (BHI) services were delivered. Since the add-on codes vary in reimbursement based on complexity and time, accurate documentation of services rendered is essential to prevent overbilling.
There is also a risk of duplicate billing if a provider submits both the APCM add-on code and a standalone behavioral health integration code (such as 99484) for the same service period. CMS guidelines prohibit billing for the same service under multiple codes, and SIUs should monitor for patterns that suggest unbundling or duplicate claims.
insufficient documentation of the behavioral health care plan, patient consent, or ongoing treatment adjustments could lead to claim denials or allegations of fraud if services are billed without meeting the required components of BHI or CoCM.
What Health Plans and SIUs Should Monitor
To mitigate risks, health plans and SIUs should verify that:
- The patient has an active APCM enrollment for the month in which the BHI or CoCM add-on code is billed.
- The services billed align with the defined components of either behavioral health integration or psychiatric collaborative care management.
- No standalone behavioral health codes are submitted for the same time period as the APCM add-on code.
- Documentation includes evidence of care planning, patient engagement, medication management (if applicable), and regular follow-up.
Providers should also ensure that any behavioral health services delivered are consistent with the patient’s diagnosed condition and that treatment plans are reviewed and adjusted as needed over time. Transparent communication with patients about the nature of these services and associated costs remains a best practice.
Where to Find Official Guidance and Updates
For the most current information on APCM, BHI, and CoCM billing requirements, stakeholders can refer to the official CMS Physician Fee Schedule and related transmittals. The Medicare Coverage Database provides detailed information on CPT/HCPCS codes, including descriptors and billing rules for behavioral health integration services.
Additional resources include the CMS Innovation Center website, which outlines ongoing models and demonstrations related to integrated care, and the Medicare.gov behavioral health coverage page, which explains beneficiary costs and eligibility for Part B-covered services.
As CMS continues to refine its approach to integrated care payment models, staying informed through official channels will be critical for ensuring compliance, preventing fraud, and supporting equitable access to behavioral health services within primary care.
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