2026 ICD-10-CM Diagnosis Code H74.399Other acquired abnormalities of ear ossicles, unspecified ear

ICD-10-CM Codes›H60–H95›H65-H75›H74

ICD-10-CM H74.399
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H74.399 is a billable ICD-10-CM diagnosis code for other acquired abnormalities 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
H74.399
Billable Status
Yes — Valid for Submission
Code Describes
Other acquired abnormalities of ear ossicles, unspecified ear
Short Description
Other acquired abnormalities of ear ossicles, unsp ear
Parent Code
H74.39
Other acquired abnormalities 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 CodeH74.399Other acquired abnormalities of ear ossicles, unspecified ear

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absent stapes superstructure
  • Acquired abnormality of ear ossicles
  • Fibrous long process of incus
  • Finding of incus mobility
  • Finding of malleus mobility
  • Finding of stapes mobility
  • Incus abnormal
  • Incus fixed
  • Incus mobility increased
  • Incus mobility reduced
  • Incus not seen
  • Isolated stapes head
  • Malleus abnormal
  • Malleus fixed
  • Malleus mobility increased
  • Malleus not seen
  • Ossicles abnormal
  • Ossicles absent
  • Ossicles not seen
  • Stapes abnormal
  • Stapes fixed
  • Stapes mobility increased
  • Stapes mobility reduced
  • Stapes not seen
  • Total loss of ossicle
  • Truncated long process of incus

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 H74.399 to ICD-9-CMHistory

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

ICD-9-CM
385.23 Dislocation 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 H74.399Overview

Is H74.399 (Other acquired abnormalities of ear ossicles) a billable code?

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

What MS-DRG does H74.399 group to?

When other acquired abnormalities 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 H74.399?

Under the General Equivalence Mappings, other acquired abnormalities of ear ossicles, unspecified ear converts to ICD-9-CM 385.23 (dislocation 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.