M01.X0

Direct infection of unspecified joint in infectious and parasitic diseases classified elsewhere

Billable FY2026 2025-10-01 → 2026-09-30

This is the unspecified option. 9 more specific codes sit alongside it. Worth checking whether the documentation supports one of them.

Exclusions 21 never code together

M01code

Excludes1

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

M00-M99chapter

Excludes2

arthropathic psoriasis (L40.5-)L40.5-
certain conditions originating in the perinatal period (P04-P96)P04-P96
certain infectious and parasitic diseases (A00-B99)A00-B99
compartment syndrome (traumatic) (T79.A-)T79.A-
complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
neoplasms (C00-D49)C00-D49
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 7

M01code

Code first

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

M00-M25block

Includes

Disorders affecting predominantly peripheral (limb) joints

M00-M99chapter

Notes

Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Index entries leading here 1 filed at M01

The index files this at M01. The tabular extends it — laterality, staging, or the 7th character — so these entries lead to the family rather than to M01.X0 exactly.

Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) M19.90
- due to or associated with
  - infectious disease NEC M01
- in (due to)
  - infectious disease NEC M01

Alongside this code 9 same parent — M01.X

M01.X1 Direct infct of shldr jt in infec/parastc dis classd elswhr category M01.X2 Direct infct of elbow in infec/parastc dis classd elswhr category M01.X3 Direct infct of wrist in infec/parastc dis classd elswhr category M01.X4 Direct infct of hand in infec/parastc diseases classd elswhr category M01.X5 Direct infct of hip in infec/parastc diseases classd elswhr category M01.X6 Direct infct of knee in infec/parastc diseases classd elswhr category M01.X7 Direct infct of ank/ft in infec/parastc dis classd elswhr category M01.X8 Direct infct of verteb in infec/parastc dis classd elswhr M01.X9 Dir infct of mult joints in infec/parastc dis classd elswhr

Medications 1

55 Bone Diseases, Infectious drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC39 CMS28HCC92 ESRD21HCC39 ESRD24HCC39

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: M01.X
Block: M00-M25
Siblings: 9

Present FY2024–FY2027.