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ICD-10-CM 2027 diagnosis code

C23Malignant neoplasm of gallbladder

✓ Billable / specificCC — complication/comorbidity

C23 is a valid, billable ICD-10-CM code for malignant neoplasm of gallbladder. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About C23

C23 is the ICD-10-CM diagnosis code for malignant neoplasm of gallbladder. It belongs to block C15-C26 (malignant neoplasms of digestive 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.

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 435 (Malignancy of Hepatobiliary System or Pancreas with MCC, relative weight 1.843), DRG 436 (Malignancy of Hepatobiliary System or Pancreas with CC, relative weight 1.1224) and DRG 437 (Malignancy of Hepatobiliary System or Pancreas without CC/MCC, relative weight 0.8081), in MDC 07 (Diseases and Disorders of the Hepatobiliary System and Pancreas), 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 156.0 (malignant neoplasm of gallbladder).

Notes that apply from higher levels

Instructions written at a parent level also apply to C23.

Broader instructions also apply from C15-C26 Malignant neoplasms of digestive organs and Chapter 2: Neoplasms.

Table of Drugs & Neoplasms entries

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 →
  • 156.0Malignant neoplasm of gallbladderexact

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 C23

Is C23 billable?

Yes. C23 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C23 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C23 as a principal diagnosis.

Is C23 a CC or MCC?

C23 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does C23 group to?

C23 is used in the MS-DRG v44.0 logic for MS-DRG 435 (Malignancy of Hepatobiliary System or Pancreas with MCC), MS-DRG 436 (Malignancy of Hepatobiliary System or Pancreas with CC) and MS-DRG 437 (Malignancy of Hepatobiliary System or Pancreas 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 C23?

The CMS General Equivalence Mappings map C23 to ICD-9-CM 156.0.