ICD-10-CM 2027 diagnosis code
C32.1Malignant neoplasm of supraglottis
C32.1 is a valid, billable ICD-10-CM code for malignant neoplasm of supraglottis. 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 C32.1
C32.1 is the ICD-10-CM diagnosis code for malignant neoplasm of supraglottis. It belongs to category C32 (malignant neoplasm of larynx), 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 C32 (malignant neoplasm of larynx), C32.1 is specifically for malignant neoplasm of supraglottis. Related codes cover glottis (C32.0), subglottis (C32.2), laryngeal cartilage (C32.3), overlapping sites of larynx (C32.8) and unspecified (C32.9).
The conditions in its Excludes2 note aren't part of C32.1, but may be coded alongside it if the patient has both: malignant neoplasm of anterior surface of epiglottis (C10.1), malignant neoplasm of aryepiglottic fold or interarytenoid fold, hypopharyngeal aspect (C13.1), malignant neoplasm of aryepiglottic fold or interarytenoid fold, marginal zone (C13.1) and malignant neoplasm of aryepiglottic fold or interarytenoid fold NOS (C13.1).
Use an additional code to identify: alcohol abuse and dependence (F10.-), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), DRG 146 (Ear, Nose, Mouth and Throat Malignancy with MCC, relative weight 2.1329), DRG 147 (Ear, Nose, Mouth and Throat Malignancy with CC, relative weight 1.3055) and DRG 148 (Ear, Nose, Mouth and Throat Malignancy without CC/MCC, relative weight 0.8008), in Pre-MDC and MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), 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 161.1 (malignant neoplasm of supraglottis).
Coding notes
- Malignant neoplasm of aryepiglottic fold or interarytenoid fold, laryngeal aspect
- Malignant neoplasm of epiglottis (suprahyoid portion) NOS
- Malignant neoplasm of extrinsic larynx
- Malignant neoplasm of false vocal cord
- Malignant neoplasm of posterior (laryngeal) surface of epiglottis
- Malignant neoplasm of ventricular bands
- malignant neoplasm of anterior surface of epiglottis (C10.1)
- malignant neoplasm of aryepiglottic fold or interarytenoid fold, hypopharyngeal aspect (C13.1)
- malignant neoplasm of aryepiglottic fold or interarytenoid fold, marginal zone (C13.1)
- malignant neoplasm of aryepiglottic fold or interarytenoid fold NOS (C13.1)
Notes that apply from higher levels
Instructions written at a parent level also apply to C32.1.
› From C32 Malignant neoplasm of larynx
- code to identify:
- alcohol abuse and dependence (F10.-)
- exposure to environmental tobacco smoke (Z77.22)
- exposure to tobacco smoke in the perinatal period (P96.81)
- history of tobacco dependence (Z87.891)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
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 › aryepiglottic fold › laryngeal aspect — Malignant Primary
- Neoplasm, neoplastic › cartilage (articular) (joint) NEC › epiglottis — Malignant Primary
- Neoplasm, neoplastic › cord (true) (vocal) › false — Malignant Primary
- Neoplasm, neoplastic › epiglottis — Malignant Primary
- Neoplasm, neoplastic › epiglottis › posterior (laryngeal) surface — Malignant Primary
- Neoplasm, neoplastic › epiglottis › suprahyoid portion — Malignant Primary
- Neoplasm, neoplastic › interarytenoid fold › laryngeal aspect — Malignant Primary
- Neoplasm, neoplastic › larynx, laryngeal NEC › aryepiglottic fold — Malignant Primary
- Neoplasm, neoplastic › larynx, laryngeal NEC › extrinsic NEC — Malignant Primary
- Neoplasm, neoplastic › larynx, laryngeal NEC › interarytenoid fold — Malignant Primary
- Neoplasm, neoplastic › larynx, laryngeal NEC › ventricular band — Malignant Primary
- Neoplasm, neoplastic › supraglottis — Malignant Primary
- Neoplasm, neoplastic › ventricular band of larynx — Malignant Primary
- Neoplasm, neoplastic › vocal cords (true) › false — Malignant Primary
Codes whose notes reference C32.1
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 PRE · Pre-MDC
MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat
ICD-9-CM equivalent
Converter →- 161.1Malignant neoplasm of supraglottisexact
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 C32.1
Is C32.1 billable?
- Yes. C32.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can C32.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict C32.1 as a principal diagnosis.
Is C32.1 a CC or MCC?
- No. C32.1 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does C32.1 group to?
- C32.1 is used in the MS-DRG v44.0 logic for MS-DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC), MS-DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC), MS-DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC), MS-DRG 146 (Ear, Nose, Mouth and Throat Malignancy with MCC), MS-DRG 147 (Ear, Nose, Mouth and Throat Malignancy with CC) and MS-DRG 148 (Ear, Nose, Mouth and Throat Malignancy 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 C32.1?
- The CMS General Equivalence Mappings map C32.1 to ICD-9-CM 161.1.