2026 ICD-10-CM Diagnosis Code A69.23Arthritis due to Lyme disease

ICD-10-CM Codes›A00–B99›A65-A69›A69

ICD-10-CM A69.23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A69.23 is a billable ICD-10-CM diagnosis code for arthritis due to Lyme disease. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. Coders also document this condition as arthritis caused by Spirochaetales. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Infective arthritis; and Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
A69.23
Billable Status
Yes — Valid for Submission
Code Describes
Arthritis due to Lyme disease
Short Description
Arthritis due to Lyme disease
Same as the full description in the CMS dataset.
Parent Code
A69.2
Lyme disease

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA65-A69Other spirochetal diseases
CategoryA69Other spirochetal infections
This CodeA69.23Arthritis due to Lyme disease

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis caused by Spirochaetales
  • Lyme arthritis
  • Lyme arthritis of knee joint
  • Skeletal Lyme disease

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.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • due to or associated with
        • Lyme disease
    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • in (due to)
        • Lyme disease

Clinical ClassificationClinical

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

CCSR MUS001
Infective arthritis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Lyme Arthritis

    joint inflammation, most often affecting large joints, associated with lyme disease, presenting months after infection.

Patient EducationClinical

Infectious Arthritis

Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Infectious arthritis is an infection in the joint. The infection comes from a bacterial, viral, or fungal infection that spreads from another part of the body. Symptoms of infectious arthritis include:

Read the full article at MedlinePlus

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

Convert A69.23 to ICD-9-CMHistory

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

ICD-9-CM
088.81 Lyme disease
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 A69.23Overview

Is A69.23 (Lyme disease) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report arthritis due to Lyme disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A69.23 group to?

When arthritis due to Lyme disease is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A69.23?

Under the General Equivalence Mappings, arthritis due to Lyme disease converts to ICD-9-CM 088.81 (Lyme disease). 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.