ICD-10-CM 2027 diagnosis code
C38.0Malignant neoplasm of heart
C38.0 is a valid, billable ICD-10-CM code for malignant neoplasm of heart. 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 C38.0
C38.0 is the ICD-10-CM diagnosis code for malignant neoplasm of heart. It belongs to category C38 (malignant neoplasm of heart, mediastinum and pleura), block C30-C39 (malignant neoplasms of respiratory and intrathoracic organs) 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 C38 (malignant neoplasm of heart, mediastinum and pleura), C38.0 is specifically for malignant neoplasm of heart. Related codes cover anterior mediastinum (C38.1), posterior mediastinum (C38.2), mediastinum, part unspecified (C38.3), pleura (C38.4) and overlapping sites of heart, mediastinum and pleura (C38.8).
Don't report C38.0 together with the conditions in its Excludes1 note: malignant neoplasm of great vessels (C49.3).
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 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508) and DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), in MDC 05 (Diseases and Disorders of the Circulatory System), 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 164.1 (malignant neoplasm of heart).
Coding notes
- Malignant neoplasm of pericardium
- malignant neoplasm of great vessels (C49.3)
Notes that apply from higher levels
Instructions written at a parent level also apply to C38.0.
› From C38 Malignant neoplasm of heart, mediastinum and pleura
- mesothelioma (C45.-)
Broader instructions also apply from C30-C39 Malignant neoplasms of respiratory and intrathoracic organs and Chapter 2: Neoplasms.
Table of Drugs & Neoplasms entries
- Neoplasm, neoplastic › atrium, cardiac — Malignant Primary
- Neoplasm, neoplastic › endocardium — Malignant Primary
- Neoplasm, neoplastic › epicardium — Malignant Primary
- Neoplasm, neoplastic › heart — Malignant Primary
- Neoplasm, neoplastic › myocardium — Malignant Primary
- Neoplasm, neoplastic › myopericardium — Malignant Primary
- Neoplasm, neoplastic › pericardium — Malignant Primary
- Neoplasm, neoplastic › ventricle (cerebral) (floor) (lateral) (third) › cardiac (left) (right) — Malignant Primary
Codes whose notes reference C38.0
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.
MDC 05 · Diseases and Disorders of the Circulatory System
ICD-9-CM equivalent
Converter →- 164.1Malignant neoplasm of heartapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about C38.0
Is C38.0 billable?
- Yes. C38.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can C38.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict C38.0 as a principal diagnosis.
Is C38.0 a CC or MCC?
- C38.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does C38.0 group to?
- C38.0 is used in the MS-DRG v44.0 logic for MS-DRG 314 (Other Circulatory System Diagnoses with MCC), MS-DRG 315 (Other Circulatory System Diagnoses with CC) and MS-DRG 316 (Other Circulatory System Diagnoses 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 C38.0?
- The CMS General Equivalence Mappings map C38.0 to ICD-9-CM 164.1.