2026 ICD-10-CM Diagnosis Code H95.121Granulation of postmastoidectomy cavity, right ear

ICD-10-CM Codes›H60–H95›H95›H95

ICD-10-CM H95.121
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H95.121 is a billable ICD-10-CM diagnosis code for granulation of postmastoidectomy cavity, right ear. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156. Coders also document this condition as granulation of right mastoid cavity. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diseases of middle ear and mastoid (except otitis media) and Postprocedural or postoperative ear and/or mastoid process complication.

Code Identity

ICD-10-CM Code
H95.121
Billable Status
Yes — Valid for Submission
Code Describes
Granulation of postmastoidectomy cavity, right ear
Short Description
Granulation of postmastoidectomy cavity, right ear
Same as the full description in the CMS dataset.
Parent Code
H95.12
Granulation of postmastoidectomy cavity

Code Classification

ChapterH60–H95Diseases of the ear and mastoid process
SectionH95Intraoperative and postprocedural complications and disorders of ear and mastoid process, not elsewhere classified
CategoryH95Intraoperative and postprocedural complications and disorders of ear and mastoid process, not elsewhere classified
This CodeH95.121Granulation of postmastoidectomy cavity, right ear

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Granulation of right mastoid cavity
  • Granulations of mastoid cavity

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EAR002
Diseases of middle ear and mastoid (except otitis media)
Default principal diagnosis: inpatient No · outpatient No
CCSR EAR005
Postprocedural or postoperative ear and/or mastoid process complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert H95.121 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
383.33 Postmastoid granulations
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H95.121Overview

Is H95.121 (Granulation of postmastoidectomy cavity) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report granulation of postmastoidectomy cavity, right ear on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H95.121 group to?

When granulation of postmastoidectomy cavity, right ear is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, with relative weights from 0.6911 to 1.5635 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H95.121?

Under the General Equivalence Mappings, granulation of postmastoidectomy cavity, right ear converts to ICD-9-CM 383.33 (postmastoid granulations). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.