ICD-10 C58
Billable / Specific HCC v28: 10Malignant neoplasm of placenta
About ICD-10-CM C58
ICD-10-CM code C58 represents Malignant neoplasm of placenta. This is a billable/specific code in the chapter (block C58). The 2026 edition of ICD-10-CM C58 became effective on October 1, 2025.
Coding Tips for C58
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
C58 is a CMS-HCC v28 risk-adjustment code (category 10). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Type 1 Excludes
Pure excludes, these codes can never be coded together with C58. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- chorioadenoma (destruens) (D39.2)
- hydatidiform mole NOS (O01.9)
- invasive hydatidiform mole (D39.2)
- male choriocarcinoma NOS (C62.9-)
- malignant hydatidiform mole (D39.2)
Includes
- choriocarcinoma NOS
- chorionepithelioma NOS
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for C58
Local Coverage Determinations (LCDs) from CMS MACs that list C58 as a covered diagnosis.
Showing top 10 of 619 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing C58.
2 Cigna
5 Medicare
CPT Codes Commonly Billed with C58
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
Convert C58 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| C58 | 181 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To C58
Other codes in section C51-C58 (Malignant neoplasms of female genital organs).
ICD-10 C58, Billing FAQ
Is ICD-10 code C58 billable? +
Yes, C58 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for C58? +
Type 1 Excludes (never code together with C58): chorioadenoma (destruens) (D39.2); hydatidiform mole NOS (O01.9); invasive hydatidiform mole (D39.2)
Does C58 affect Medicare Advantage HCC risk adjustment? +
Yes. C58 maps to CMS-HCC v28 category 10. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What CPT codes are commonly billed with C58? +
Procedures frequently paired with C58 include: A9611, A4641, A9555, A9526.
What ICD-9 codes does C58 map to? +
Per CMS GEMs, C58 maps to ICD-9 codes: 181. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 18, 2026.
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