M01 – Direct infections of joint in infectious and parasitic diseases classified elsewhere

ICD-10-CM 2027 diagnosis code · Infectious arthropathies

Non-billable header

ICD-10-CM code M01

Code: M01 (claims format: M01)
Description: Direct infections of joint in infectious and parasitic diseases classified elsewhere
Short description: Direct infect of joint in infec/parastc dis classd elswhr
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M00-M02 Infectious arthropathies

Billable codes under M01

M01 is a header code and cannot be used on claims. Choose the most specific code:

M01.X – Direct infection of joint in infectious and parasitic diseases classified elsewhereHeader (more codes below)

Notes for M01

Excludes1 (not coded here):

arthropathy in Lyme disease (A69.23)
gonococcal arthritis (A54.42)
meningococcal arthritis (A39.83)
mumps arthritis (B26.85)
postinfective arthropathy (M02.-)
postmeningococcal arthritis (A39.84)
reactive arthritis (M02.3)
rubella arthritis (B06.82)
sarcoidosis arthritis (D86.86)
typhoid fever arthritis (A01.04)
tuberculosis arthritis (A18.01-A18.02)

Code first:

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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block M00-M02

Notes:

This block comprises arthropathies due to microbiological agents. Distinction is made between the following types of etiological relationship:
a) direct infection of joint, where organisms invade synovial tissue and microbial antigen is present in the joint;
b) indirect infection, which may be of two types: a reactive arthropathy, where microbial infection of the body is established but neither organisms nor antigens can be identified in the joint, and a postinfective arthropathy, where microbial antigen is present but recovery of an organism is inconstant and evidence of local multiplication is lacking.

Frequently asked questions

What is ICD-10 code M01?

M01 is the ICD-10-CM code for direct infections of joint in infectious and parasitic diseases classified elsewhere, in the block M00-M02 (Infectious arthropathies).

Is M01 a billable code?

No. M01 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.