S3645 HCPCS Level II code: Hiv-1 antibody testing of oral mucosal transudate
S3645 is the HCPCS code for “Hiv-1 antibody testing of oral mucosal transudate” in CMS’s October 2026 release, in effect from Oct 1, 2026.
Official description
S3645Hiv-1 antibody testing of oral mucosal transudate
Short description: Hiv-1 antibody testing of or
HCPCS · United States
Notes for S3645
As CMS prints them, with any note S3645 takes from the headings above it.
Note
- CMS processing note 0088: "S" CODES ARE UNIQUE TEMPORARY CODES ESTABLISHED BY BCBSA AND HIAA FOR PRIVATE PAYOR USE. THEY ARE NOT VALID NOR PAYABLE BY MEDICARE.
Medicare details
The indicators CMS publishes with S3645 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Not payable by Medicare
- Medicare pricing
- Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)
- Type of service
- Other medical items or services
- BETOS category
- Undefined codes
- Added
- Jan 1, 2000
Where S3645 sits
- 1S codesTemporary national codes (non-Medicare)
- 2Active code S3645Hiv-1 antibody testing of oral mucosal transudate
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code S3645 mean?
S3645 is the HCPCS code for “Hiv-1 antibody testing of oral mucosal transudate” in CMS’s HCPCS Level II October 2026 release.
Does Medicare cover S3645?
CMS lists S3645’s Medicare coverage as “Not payable by Medicare” and its pricing as “Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside S3645
All S codesS3000Diabetic indicator; retinal eye exam, dilated, bilateralS3005Performance measurement, evaluation of patient self assessment, depressionS3600Stat laboratory request (situations other than s3601)S3601Emergency stat laboratory charge for patient who is homebound or residing in a nursing facilityS3620Newborn metabolic screening panel, includes test kit, postage and the laboratory tests specified by the state for inclusion in this panel (e.g., galactose; hemoglobin…S3630Eosinophil count, blood, directS3650Saliva test, hormone level; during menopauseS3652Saliva test, hormone level; to assess preterm labor riskS3655Antisperm antibodies test (immunobead)S3708Gastrointestinal fat absorption studyS3721Prostate cancer antigen 3 (pca3) testingS3722Dose optimization by area under the curve (auc) analysis, for infusional 5-fluorouracil