2027 ICD-10-CM Diagnosis Code H66.3X2Other chronic suppurative otitis media, left ear

ICD-10-CM Codes›H60–H95›H65-H75›H66

ICD-10-CM H66.3X2
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H66.3X2 is a billable ICD-10-CM diagnosis code for other chronic suppurative otitis media, left ear. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 152 through 153. Coders also document this condition as chronic suppurative otitis media of left middle ear. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Otitis media.

This medical diagnosis code is frequently used in Pediatrics medical specialties to designate conditions such other chronic suppurative otitis media.

Code Identity

ICD-10-CM Code
H66.3X2
Billable Status
Yes — Valid for Submission
Code Describes
Other chronic suppurative otitis media, left ear
Short Description
Other chronic suppurative otitis media, left ear
Same as the full description in the CMS dataset.
Parent Code
H66.3X
Other chronic suppurative otitis media

Code Classification

ChapterH60–H95Diseases of the ear and mastoid process
SectionH65-H75Diseases of middle ear and mastoid
CategoryH66Suppurative and unspecified otitis media
This CodeH66.3X2Other chronic suppurative otitis media, left ear

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic suppurative otitis media of left middle ear
  • Left suppurative otitis media

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H66.3X2: its own notes plus those printed at H66.3, H66, and Chapter 8. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From H66 Suppurative and unspecified otitis media applies to 36 codes
  • suppurative and unspecified otitis media with myringitis

Excludes1

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

From H66.3 Other chronic suppurative otitis media applies to 4 codes
  • tuberculous otitis media (A18.6)

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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From H66.3 Other chronic suppurative otitis media applies to 4 codes
  • code for any associated perforated tympanic membrane (H72.-)
From H66 Suppurative and unspecified otitis media applies to 36 codes
  • 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)

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name H66.3X2, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming H66.3X2: they are not reported together with it, unless the two conditions are unrelated.

  • H73.0 Acute myringitis
    acute myringitis with otitis media (H65, H66) names H66, which includes this code
  • H73.1 Chronic myringitis
    chronic myringitis with otitis media (H65, H66) names H66, which includes this code

Code First 2

These codes say to code first a condition named in the note, and H66.3X2 is one of the conditions named.

  • H72 Perforation of tympanic membrane
    any associated otitis media (H65.-, H66.1-, H66.2-, H66.3-, H66.4-, H66.9-, H67.-) names H66.3-, which includes this code
  • G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
    suppurative otitis media (H66.01-H66.4) names H66.01-H66.4, which includes this code

Clinical ClassificationClinical

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

CCSR EAR001
Otitis media
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Ear Infections

Ear infections are the most common reason parents bring their child to a doctor. Three out of four children will have at least one ear infection by their third birthday. Adults can also get ear infections, but they are less common.

Read the full article at MedlinePlus

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

Convert H66.3X2 to ICD-9-CMHistory

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

ICD-9-CM
382.3 Chr sup otitis media NOS
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 H66.3X2Overview

What is the ICD-10 code for other chronic suppurative otitis media, left ear?

The ICD-10-CM code for other chronic suppurative otitis media, left ear is H66.3X2 (sometimes written as H663X2). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H66.3X2 (Other chronic suppurative otitis media) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other chronic suppurative otitis media, left ear on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H66.3X2 group to?

When other chronic suppurative otitis media, left ear is the principal diagnosis on an inpatient stay, it groups to MS-DRG 152, 153, with relative weights from 0.7420 to 1.1147 depending on complications. Higher weights mean higher Medicare reimbursement.

Can H66.3X2 be reported with A18.6?

Not as a rule. The Excludes1 note at H66.3, which applies to H66.3X2, lists "tuberculous otitis media (A18.6)". 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).

Does H66.3X2 need an additional code?

When the condition applies, yes. The Use Additional Code note at H66.3, which applies to H66.3X2, reads: code for any associated perforated tympanic membrane (H72.-). The additional code is reported after H66.3X2.