2026 ICD-10-CM Diagnosis Code B05.81Measles keratitis and keratoconjunctivitis

ICD-10-CM Codes›A00–B99›B00-B09›B05

ICD-10-CM B05.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B05.81 is a billable ICD-10-CM diagnosis code for measles keratitis and keratoconjunctivitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as measles keratitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease and Viral infection.

Code Identity

ICD-10-CM Code
B05.81
Billable Status
Yes — Valid for Submission
Code Describes
Measles keratitis and keratoconjunctivitis
Short Description
Measles keratitis and keratoconjunctivitis
Same as the full description in the CMS dataset.
Parent Code
B05.8
Measles with other complications

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB00-B09Viral infections characterized by skin and mucous membrane lesions
CategoryB05Measles
This CodeB05.81Measles keratitis and keratoconjunctivitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Measles keratitis
  • Measles keratoconjunctivitis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Keratitis(nodular) (nonulcerative) (simple) (zonular)
      • in (due to)
        • measles
    • Keratitis(nodular) (nonulcerative) (simple) (zonular)
      • postmeasles
    • Keratoconjunctivitis
      • postmeasles
    • Measles(black) (hemorrhagic) (suppressed)
      • with
        • keratitis (keratoconjunctivitis)

Clinical ClassificationClinical

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

CCSR EYE001
Cornea and external disease
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Measles

Measles is an infectious disease caused by a virus. It spreads easily from person to person. It causes a blotchy red rash. The rash often starts on the head and moves down the body. Other symptoms include:

Read the full article at MedlinePlus

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

Convert B05.81 to ICD-9-CMHistory

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

ICD-9-CM
055.71 Measles keratitis
Exact Match The mapping is direct, with no qualifiers.

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 B05.81Overview

Is B05.81 (Measles with other complications) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report measles keratitis and keratoconjunctivitis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B05.81 group to?

When measles keratitis and keratoconjunctivitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B05.81?

Under the General Equivalence Mappings, measles keratitis and keratoconjunctivitis converts to ICD-9-CM 055.71 (measles keratitis). The mapping is a direct match.

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.