C53.9
BillableMalignant neoplasm of cervix uteri, unspecified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C53.9 an HCC code?
Yes. C53.9 maps to Colorectal, Bladder, and Other Cancers under the CMS-HCC V28 risk adjustment model (and Colorectal, Bladder, and Other Cancers under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for C53.9
For C53.9to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed C53.9 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C53.9 is the ICD-10-CM diagnosis code for malignant neoplasm of cervix uteri, unspecified. Cancer of the cervix where the specific location within the cervix is not documented or cannot be determined. C53.9 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of female genital organs (c51-c58).
Under the CMS-HCC V28 risk adjustment model, C53.9 maps to Colorectal, Bladder, and Other Cancers (HCC 22) with a community, non-dual, aged base RAF weight of 0.000. Under the older V24 model, C53.9 mapped to the same category but with a base RAF weight of 0.306 — V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
This is a non-specific code; query the provider for more detailed anatomical location when possible. Because C53.9 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for C53.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a non-specific code; query the provider for more detailed anatomical location when possible
- •Ensure all available staging and histological information is captured even if site is unspecified
Clinical Significance
Malignant neoplasm of cervix uteri, unspecified, is used when cervical cancer is confirmed but the specific subsite (endocervix vs. exocervix) is not documented. While commonly used, this code represents a documentation opportunity because pathology reports and colposcopy findings typically specify the cervical subsite.
Documentation Requirements
- ✓Confirmed malignant neoplasm of the cervix
- ✓Histological type and grade
- ✓FIGO staging
- ✓Evidence that more specific subsite could not be determined
- ✓Human Papillomavirus status if available
- ✓Treatment plan and current disease status
Commonly Confused Codes
- •C53.0 — Endocervix; use when the inner cervical canal is specifically involved
- •C53.1 — Exocervix; use when the outer cervical surface is specifically involved
- •C53.8 — Overlapping cervical sites; use when tumor spans endocervix and exocervix
- •D06.9 — Carcinoma in situ of cervix, unspecified; preinvasive disease, not invasive cancer
- •Z85.41 — Personal history of cervical cancer; use when treatment is completed and no active disease