Medicare does not pay under the clinical social worker benefit for hospital inpatients, partial hospitalization or intensive outpatient program patients at a hospital outpatient department or CMHC, patients in a Part A skilled nursing stay, or services an ESRD facility must provide. Unlike CSWs, MFT and mental health counselor services to SNF residents are excluded from consolidated billing.
The clinical social worker (CSW) benefit covers diagnosis and treatment of mental illness that a CSW is licensed to provide. It does not follow the patient everywhere. Regulation and CMS guidance carve out several settings, and claims for them are denied however good the documentation is.
The carve-outs
1. Hospital inpatients
42 CFR 410.73(b)(2)(i) says services a CSW furnishes to an inpatient of a Medicare-participating hospital are not CSW services for Part B billing, and 410.73(d) says the CSW may not bill Medicare for them. The hospital's payment is meant to cover them. If you consult on an inpatient unit, your pay comes from the hospital, not from a Part B claim.
2. Partial hospitalization and intensive outpatient programs
CMS's Medicare & Mental Health Coverage booklet (MLN1986542, March 2026) says Medicare does not pay under the CSW benefit for services to patients in a partial hospitalization program (PHP) or intensive outpatient program (IOP) furnished at a hospital outpatient department or community mental health center. Those programs are paid to the facility as a package.
3. Patients in a Part A skilled nursing facility stay
This one costs practices the most. The Balanced Budget Act put CSW services under SNF consolidated billing: during a Part A SNF stay, CSW services are included in the SNF's prospective payment rate and cannot be billed separately to Part B. CMS's Claims Processing Manual describes an edit that rejects CSW claims for beneficiaries in a Part A stay for dates of service on or after April 1, 2001. The regulation phrases it as services to an inpatient of a Medicare-participating SNF.
Once the Part A stay ends and the resident stays on as a long-term resident under Part B, the picture can change. Check the beneficiary's status before each billing period, not once at admission.
4. Dialysis facilities
Services to a patient in a Medicare-participating ESRD facility are excluded when they are services the facility must provide under its conditions for coverage. The facility's own social work staff are part of that package.
How this differs for counselors and MFTs
Medicare added marriage and family therapists and mental health counselors (MHCs) as independent billers from January 1, 2024. Unlike CSWs, CMS says it excludes MFT and MHC services to SNF residents from consolidated billing, so those clinicians bill Part B and include the SNF's Medicare provider number on the claim. Same building, same patient, different answer depending on the license.
The PHP and IOP exclusion, by comparison, applies to all three. For a broader comparison of the licenses, White Glove Counseling's LPC vs. LMFT vs. LCSW covers scope and portability side by side.
Two more limits that are not about setting
- Nothing can be billed incident to a CSW. CMS does not cover services provided incident to a CSW's own services.
- The consultation rule. You must notify or attempt to notify the patient's physician (with consent) unless the physician referred the patient, and neither you nor the physician can bill Medicare or the patient for that consultation.
What to do with this
If your practice serves nursing homes or works alongside hospital programs, check each patient's Part A status and program enrollment before you schedule, and keep the check in the chart. And confirm you are licensed in the state where each patient sits; the setting rules only matter once the licensing is in order. Our overview of Medicare for clinical social workers covers enrollment, and our state license services cover the rest.
Common questions
- Can I bill Part B for therapy with a nursing home resident?
- Not while the resident is in a Part A SNF stay; CSW services are part of the SNF's payment then. Check the resident's Part A status before each billing period.
- Why can a counselor bill for a SNF resident when I cannot?
- CMS excludes MFT and mental health counselor services to SNF residents from consolidated billing, but clinical social worker services remain subject to it during a Part A stay.
- Can I bill Medicare for groups in a hospital's partial hospitalization program?
- No. CMS says it does not pay under the CSW benefit for patients in a PHP or IOP furnished by a hospital outpatient department or community mental health center.
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