2027 ICD-10-CM Diagnosis Code H75.02Mastoiditis in infectious and parasitic diseases classified elsewhere, left ear

ICD-10-CM Codes›H60–H95›H65-H75›H75

ICD-10-CM H75.02
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H75.02 is a billable ICD-10-CM diagnosis code for mastoiditis in infectious and parasitic diseases classified elsewhere, left ear. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 154 through 156. The code is a manifestation code that cannot be reported as the principal diagnosis. 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
H75.02
Billable Status
Yes — Valid for Submission
Code Describes
Mastoiditis in infectious and parasitic diseases classified elsewhere, left ear
Short Description
Mastoiditis in infec/parastc dis classd elswhr, left ear
Parent Code
H75.0
Mastoiditis in infectious and parasitic diseases classified elsewhere

Code Classification

ChapterH60–H95Diseases of the ear and mastoid process
SectionH65-H75Diseases of middle ear and mastoid
CategoryH75Other disorders of middle ear and mastoid in diseases classified elsewhere
This CodeH75.02Mastoiditis in infectious and parasitic diseases classified elsewhere, left ear

Code EditsBilling

Medicare Code Editor checks that affect claim validity for H75.02.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H75.02: its own notes plus those printed at H75.0, H75, and Chapter 8. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From H75.0 Mastoiditis in infectious and parasitic diseases classified elsewhere applies to 4 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 8 (H60-H95) Diseases of the ear and mastoid process applies to 653 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code First

The underlying condition named in the note is sequenced before this code.

From H75 Other disorders of middle ear and mastoid in diseases classified elsewhere applies to 8 codes
  • underlying disease

Notes

General instructions on how these codes are used.

From Chapter 8 (H60-H95) Diseases of the ear and mastoid process applies to 653 codes
  • Use an external cause code following the code for the ear condition, if applicable, to identify the cause of the ear condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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

Patient EducationClinical

Ear Disorders

An ear disorder is any condition that changes or harms the shape or structure of your ear. This can include abnormal ear shapes you're born with, injuries that change your ear's shape, and a growth on or in the ear.

The full article covers:

  • What is an ear disorder?
  • What causes ear disorders?
  • What are the symptoms of ear disorders?
  • How are ear disorders diagnosed?
  • How are ear disorders treated?
  • Can ear disorders be prevented?

Read the full article at MedlinePlus

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

Convert H75.02 to ICD-9-CMHistory

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

ICD-9-CM
383.89 Disorders of mastoid NEC
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H75.02Overview

Is H75.02 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report mastoiditis in infectious and parasitic diseases classified elsewhere, left ear on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H75.02 group to?

On inpatient claims, mastoiditis in infectious and parasitic diseases classified elsewhere, left ear maps to MS-DRG 156, 155, 154, with relative weights from 0.6656 to 1.5916 depending on complications. Higher weights mean higher Medicare reimbursement.

Can H75.02 be a principal diagnosis?

No. This is a manifestation code: mastoiditis in infectious and parasitic diseases classified elsewhere, left ear describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

Can H75.02 be reported with A52.77?

Not as a rule. The Excludes1 note at H75.0, which applies to H75.02, lists "syphilis (A52.77)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is coded first with H75.02?

The Code First note at H75, which applies to H75.02, reads: underlying disease. When one of these applies, it is sequenced before H75.02.