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ICD-10-CM 2027 diagnosis code

C46.51Kaposi's sarcoma of right lung

✓ Billable / specificCC — complication/comorbidity

C46.51 is a valid, billable ICD-10-CM code for kaposi's sarcoma of right lung. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C46.51

C46.51 is the ICD-10-CM diagnosis code for Kaposi's sarcoma of right lung. It belongs to category C46 (Kaposi's sarcoma), block C45-C49 (malignant neoplasms of mesothelial and soft tissue) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within C46.5 (Kaposi's sarcoma of lung), C46.51 is specifically for Kaposi's sarcoma of right lung. Related codes cover unspecified lung (C46.50) and left lung (C46.52).

Code first: any human immunodeficiency virus [HIV] disease (B20).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 180 (Respiratory Neoplasms with MCC, relative weight 1.7806), DRG 181 (Respiratory Neoplasms with CC, relative weight 1.0936), DRG 182 (Respiratory Neoplasms without CC/MCC, relative weight 0.7439), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506), DRG 975 (HIV with Major Related Condition with CC, relative weight 1.3252) and DRG 976 (HIV with Major Related Condition without CC/MCC, relative weight 0.8124), in MDC 04 (Diseases and Disorders of the Respiratory System) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 176.4 (Kaposi's sarcoma, lung).

Notes that apply from higher levels

Instructions written at a parent level also apply to C46.51.

› From C46 Kaposi's sarcoma
Code first
  • any human immunodeficiency virus [HIV] disease (B20)

Broader instructions also apply from Chapter 2: Neoplasms.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 176.4Kaposi's sarcoma, lungapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C46.51

Is C46.51 billable?

Yes. C46.51 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C46.51 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C46.51 as a principal diagnosis.

Is C46.51 a CC or MCC?

C46.51 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does C46.51 group to?

C46.51 is used in the MS-DRG v44.0 logic for MS-DRG 180 (Respiratory Neoplasms with MCC), MS-DRG 181 (Respiratory Neoplasms with CC), MS-DRG 182 (Respiratory Neoplasms without CC/MCC), MS-DRG 974 (HIV with Major Related Condition with MCC), MS-DRG 975 (HIV with Major Related Condition with CC) and MS-DRG 976 (HIV with Major Related Condition without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for C46.51?

The CMS General Equivalence Mappings map C46.51 to ICD-9-CM 176.4.