Is M01 a billable ICD-10-CM code?

No. M01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M01 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Infectious arthropathies (M00-M02).

What cannot be coded together with M01?

M01 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

M01

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

Non-billable headerICD-10-CM

M01 is a non-billable header ICD-10-CM code for direct infections of joint in infectious and parasitic diseases classified elsewhere. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

The underlying condition must be sequenced before 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)

Other codes that can never be billed with M01

These codes carry an Excludes1 note pointing at M01. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M01 alone.

M02Postinfective and reactive arthropathies

Risk adjustment

M01 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead M01

1 child code. Green means billable.

M01.XDirect infection of joint in infectious and parasitic diseases classified elsewhere

Questions about M01

Is M01 a billable ICD-10-CM code?: No. M01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M01 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Infectious arthropathies (M00-M02).
What cannot be coded together with M01?: M01 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.