All ICD10 Codes
M01Not billable, use a more specific code below

Direct infections of joint in infectious and parasitic diseases classified elsewhere

In Infectious arthropathies (M00-M02), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

24 billable codes under M01: all are a CC; all map to HCC 92 (Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

Also indexed as: Arthritis, due to or associated with, infectious disease NEC; Arthritis, in, infectious disease NEC

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Instructional notes

Excludes1: not coded here, use a different code

Code first: code the underlying condition first, then this code

  • underlying disease, such as:
  • leprosy [Hansen's disease] (A30.-)
  • mycoses (B35-B49)
  • O'nyong-nyong fever (A92.1)
  • paratyphoid fever (A01.1-A01.4)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M01

M01 can't be used on a claim. Pick a billable code below; grey headings group them.

M01 MS-DRGs

As the principal diagnosis, the billable codes under M01 group to MS-DRG 548, 549, 550, or 400 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to M01

Notes on these codes point to M01.

  • M02 Excludes1: direct infections of joint in infectious and parasitic diseases classified elsewhere (M01.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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 more about infectious arthritis on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.