G9821 — No documentation of a chlamydia screening test with proper follow-up
G9821 is a HCPCS Level II code for no documentation of a chlamydia screening test with proper follow-up. It belongs to the Procedures and Professional Services (Temporary) section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Carrier judgment
Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Physician fee schedule statusM
Measurement code. Used for reporting purposes only; never paid.
Global period: XXX
Want the dollar amount for your locality? The fee calculator applies your GPCI and the current conversion factor.
The CMS record for G9821
- Long descriptor
- No documentation of a chlamydia screening test with proper follow-up
- Short descriptor
- No doc chlam scr ts w/follow
- Added
- January 1, 2017
- BETOS
- Z2
- Pricing indicator
- 00 — Not priced by Part B
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service — CMS's own analytic grouping.
Service not separately priced by Part B — not covered, bundled into another service, or used by Part A only.
Codes adjacent to G9821
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If G9821 is not quite right, the correct code is very often within a few positions of it.
- G9813Patient did not die within 30 days of the procedure or during the index hospitalization
- G9814Death occurring during the index acute care hospitalizationterminated
- G9815Death did not occur during the index acute care hospitalizationterminated
- G9816Death occurring after discharge from the hospital but within 30 days post procedureterminated
- G9817Death did not occur after discharge from the hospital within 30 days post procedureterminated
- G9818Documentation of sexual activity
- G9819Patients who use hospice services any time during the measurement period
- G9820Documentation of a chlamydia screening test with proper follow-up
- G9822Patients who had an endometrial ablation procedure during the 12 months prior to the index date (exclusive of the index date)
- G9823Endometrial sampling or hysteroscopy with biopsy and results documented during the 12 months prior to the index date (exclusive of the index date) of the endometrial ablation
- G9824Endometrial sampling or hysteroscopy with biopsy and results not documented during the 12 months prior to the index date (exclusive of the index date) of the endometrial ablation
- G9825Her-2/neu negative or undocumented/unknownterminated
- G9826Patient transferred to practice after initiation of chemotherapyterminated
- G9827Her2-targeted therapies not administered during the initial course of treatmentterminated
- G9828Her2-targeted therapies administered during the initial course of treatmentterminated
- G9829Breast adjuvant chemotherapy administeredterminated
Questions about G9821
What is HCPCS code G9821?
G9821 is a HCPCS Level II code for no documentation of a chlamydia screening test with proper follow-up. It sits in the Procedures and Professional Services (Temporary) section.
Does Medicare cover G9821?
The CMS HCPCS file marks G9821 as "Carrier judgment". Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
How is G9821 paid under the physician fee schedule?
G9821 carries PFS status code M. Measurement code. Used for reporting purposes only; never paid.