ICD-10-CM › M00-M99 › M05-M14 › M05 Rheumatoid arthritis with rheumatoid factor › M05.A
M05.A
Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2026 to now.
- FY2026 Added to the code set Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from M05 Rheumatoid arthritis with rheumatoid factor
Excludes1 - never coded here
- rheumatic fever (I00)
- juvenile rheumatoid arthritis (M08.-)
- rheumatoid arthritis of spine (M45.-)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Herniation
- Sarcoepiplocele
- Elevated, elevation > GFR
- Gangrene, gangrenous > hernia
- Hernia, hernial > irreducible
- Hernia, hernial > obstructive
- Hernia, hernial > incarcerated
- Hernia, hernial > strangulated
- Rupture, ruptured > obstructed
- Hernia, hernial > with > gangrene
- Hernia, hernial > with > irreducible
- Hernia, hernial > with > obstruction
- Incarceration, incarcerated > hernia
- Strangulation, strangulated > hernia
- Incarceration, incarcerated > rupture
- Strangulation, strangulated > rupture
- Hernia, hernial > with > incarceration
- Hernia, hernial > with > strangulation
- Hernia, hernial > intestine, intestinal
- Test, tests, testing > blood-drug > positive
- Hernia, hernial > irreducible > with gangrene
- Hernia, hernial > obstructive > with gangrene
- Abnormal, abnormality, abnormalities > finding
- Hernia, hernial > incarcerated > with gangrene
- Hernia, hernial > strangulated > with gangrene
- Test, tests, testing > blood-alcohol > positive
- Rupture, ruptured > nontraumatic, meaning hernia
- Strangulation, strangulated > stomach due to hernia
- Incarceration, incarcerated > hernia > with gangrene
- Strangulation, strangulated > hernia > with gangrene
- Strangulation, strangulated > intestine > with hernia
- Elevated, elevation > finding on laboratory examination
- Obstruction, obstructed, obstructive > fecal > with hernia
- Abnormal, abnormality, abnormalities > chemistry, blood > drugs
- Abnormal, abnormality, abnormalities > chemistry, blood > toxins
- Strangulation, strangulated > stomach due to hernia > with gangrene
- Strangulation, strangulated > intestine > with hernia > with gangrene
- Abnormal, abnormality, abnormalities > rheumatoid factor and anti-citrullinated protein antibody > with rheumatoid arthritis
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M05.0 | Felty's syndrome | Not billable |
| M05.1 | Rheumatoid lung disease with rheumatoid arthritis | Not billable |
| M05.2 | Rheumatoid vasculitis with rheumatoid arthritis | Not billable |
| M05.3 | Rheumatoid heart disease with rheumatoid arthritis | Not billable |
| M05.4 | Rheumatoid myopathy with rheumatoid arthritis | Not billable |
| M05.5 | Rheumatoid polyneuropathy with rheumatoid arthritis | Not billable |
| M05.6 | Rheumatoid arthritis with involvement of other organs and systems | Not billable |
| M05.7 | Rheumatoid arthritis with rheumatoid factor without organ or systems involvement | Not billable |
| M05.8 | Other rheumatoid arthritis with rheumatoid factor | Not billable |
| M05.9 | Rheumatoid arthritis with rheumatoid factor, unspecified | Valid |