2026 ICD-10-CM Diagnosis Code H74.329Partial loss of ear ossicles, unspecified ear

ICD-10-CM Codes›H60–H95›H65-H75›H74

ICD-10-CM H74.329
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H74.329 is a billable ICD-10-CM diagnosis code for partial loss of ear ossicles, unspecified 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diseases of middle ear and mastoid (except otitis media).

Code Identity

ICD-10-CM Code
H74.329
Billable Status
Yes — Valid for Submission
Code Describes
Partial loss of ear ossicles, unspecified ear
Short Description
Partial loss of ear ossicles, unspecified ear
Same as the full description in the CMS dataset.
Parent Code
H74.32
Partial loss of ear ossicles

Code Classification

ChapterH60–H95Diseases of the ear and mastoid process
SectionH65-H75Diseases of middle ear and mastoid
CategoryH74Other disorders of middle ear mastoid
This CodeH74.329Partial loss of ear ossicles, unspecified ear

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absent incus
  • Absent malleus and incus
  • Acquired abnormality of ear ossicles
  • Malleus absent
  • Ossicular erosion
  • Partial loss / necrosis of ossicles
  • Partial loss of ear ossicles
  • Partial necrosis of ear ossicles
  • Resorption of long process of incus
  • Stapes absent

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 Yes · outpatient Yes

Patient EducationClinical

Ear Disorders

Your ear has three main parts: outer, middle and inner. You use all of them in hearing. Sound waves come in through your outer ear. They reach your middle ear, where they make your eardrum vibrate. The vibrations are transmitted through three tiny bones, called ossicles, in your middle ear.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H74.329 to ICD-9-CMHistory

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

ICD-9-CM
385.24 Partial loss ear ossicle
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 H74.329Overview

Is H74.329 (Partial loss of ear ossicles) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report partial loss of ear ossicles, unspecified ear on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H74.329 group to?

When partial loss of ear ossicles, unspecified 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 H74.329?

Under the General Equivalence Mappings, partial loss of ear ossicles, unspecified ear converts to ICD-9-CM 385.24 (partial loss ear ossicle). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.