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ICD-10-CM 2027 diagnosis code

D00.02Carcinoma in situ of buccal mucosa

✓ Billable / specific

D00.02 is a valid, billable ICD-10-CM code for carcinoma in situ of buccal mucosa. 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 D00.02

D00.02 is the ICD-10-CM diagnosis code for carcinoma in situ of buccal mucosa. It belongs to category D00 (carcinoma in situ of oral cavity, esophagus and stomach), block D00-D09 (in situ neoplasms) 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 D00.0 (carcinoma in situ of lip, oral cavity and pharynx), D00.02 is specifically for carcinoma in situ of buccal mucosa. Related codes cover oral cavity, unspecified site (D00.00), labial mucosa and vermilion border (D00.01), gingiva and edentulous alveolar ridge (D00.03), soft palate (D00.04), hard palate (D00.05), floor of mouth (D00.06), tongue (D00.07) and pharynx (D00.08).

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 230.0 (carcinoma in situ of lip, oral cavity, and pharynx).

Notes that apply from higher levels

Instructions written at a parent level also apply to D00.02.

› From D00.0 Carcinoma in situ of lip, oral cavity and pharynx
Excludes1
  • carcinoma in situ of aryepiglottic fold or interarytenoid fold, laryngeal aspect (D02.0)
  • carcinoma in situ of epiglottis NOS (D02.0)
  • carcinoma in situ of epiglottis suprahyoid portion (D02.0)
  • carcinoma in situ of skin of lip (D03.0, D04.0)
Use additional code
  • code to identify:
  • 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)
› From D00 Carcinoma in situ of oral cavity, esophagus and stomach
Excludes1
  • melanoma in situ (D03.-)

Broader instructions also apply from D00-D09 In situ neoplasms 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 →
  • 230.0Carcinoma in situ of lip, oral cavity, and pharynxapproximate

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 D00.02

Is D00.02 billable?

Yes. D00.02 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can D00.02 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict D00.02 as a principal diagnosis.

Is D00.02 a CC or MCC?

No. D00.02 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does D00.02 group to?

D00.02 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 D00.02?

The CMS General Equivalence Mappings map D00.02 to ICD-9-CM 230.0.