ICD-10-CM 2027 diagnosis code
M05Rheumatoid arthritis with rheumatoid factor
Not billable — use a more specific code
M05 is a header code, so it can't be reported by itself. Choose one of the 11 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About M05
M05 is the ICD-10-CM diagnosis code for rheumatoid arthritis with rheumatoid factor. It belongs to block M05-M14 (inflammatory polyarthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 11 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: M05.0 (syndrome), M05.1 (arthritis), M05.2 (arthritis), M05.3 (arthritis), M05.4 (arthritis), M05.5 (arthritis), M05.6 (systems), M05.7 (without organ or systems involvement) and 3 more.
Don't report M05 together with the conditions in its Excludes1 note: rheumatic fever (I00), juvenile rheumatoid arthritis (M08.-) and rheumatoid arthritis of spine (M45.-).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under M05
- M05.0Felty's syndrome
- M05.00Felty's syndrome, unspecified siteBillable
- M05.01Felty's syndrome, shoulder
- M05.02Felty's syndrome, elbow
- M05.03Felty's syndrome, wrist
- M05.04Felty's syndrome, hand
- M05.05Felty's syndrome, hip
- M05.06Felty's syndrome, knee
- M05.07Felty's syndrome, ankle and foot
- M05.09Felty's syndrome, multiple sitesBillable
- M05.1Rheumatoid lung disease with rheumatoid arthritis
- M05.10Rheumatoid lung disease with rheumatoid arthritis of unspecified siteBillable
- M05.11Rheumatoid lung disease with rheumatoid arthritis of shoulder
- M05.12Rheumatoid lung disease with rheumatoid arthritis of elbow
- M05.13Rheumatoid lung disease with rheumatoid arthritis of wrist
- M05.14Rheumatoid lung disease with rheumatoid arthritis of hand
- M05.15Rheumatoid lung disease with rheumatoid arthritis of hip
- M05.16Rheumatoid lung disease with rheumatoid arthritis of knee
- M05.17Rheumatoid lung disease with rheumatoid arthritis of ankle and foot
- M05.19Rheumatoid lung disease with rheumatoid arthritis of multiple sitesBillable
- M05.2Rheumatoid vasculitis with rheumatoid arthritis
- M05.20Rheumatoid vasculitis with rheumatoid arthritis of unspecified siteBillable
- M05.21Rheumatoid vasculitis with rheumatoid arthritis of shoulder
- M05.22Rheumatoid vasculitis with rheumatoid arthritis of elbow
- M05.23Rheumatoid vasculitis with rheumatoid arthritis of wrist
- M05.24Rheumatoid vasculitis with rheumatoid arthritis of hand
- M05.25Rheumatoid vasculitis with rheumatoid arthritis of hip
- M05.26Rheumatoid vasculitis with rheumatoid arthritis of knee
- M05.27Rheumatoid vasculitis with rheumatoid arthritis of ankle and foot
- M05.29Rheumatoid vasculitis with rheumatoid arthritis of multiple sitesBillable
- M05.3Rheumatoid heart disease with rheumatoid arthritis
- M05.30Rheumatoid heart disease with rheumatoid arthritis of unspecified siteBillable
- M05.31Rheumatoid heart disease with rheumatoid arthritis of shoulder
- M05.32Rheumatoid heart disease with rheumatoid arthritis of elbow
- M05.33Rheumatoid heart disease with rheumatoid arthritis of wrist
- M05.34Rheumatoid heart disease with rheumatoid arthritis of hand
- M05.35Rheumatoid heart disease with rheumatoid arthritis of hip
- M05.36Rheumatoid heart disease with rheumatoid arthritis of knee
- M05.37Rheumatoid heart disease with rheumatoid arthritis of ankle and foot
- M05.39Rheumatoid heart disease with rheumatoid arthritis of multiple sitesBillable
- M05.4Rheumatoid myopathy with rheumatoid arthritis
- M05.40Rheumatoid myopathy with rheumatoid arthritis of unspecified siteBillable
- M05.41Rheumatoid myopathy with rheumatoid arthritis of shoulder
- M05.42Rheumatoid myopathy with rheumatoid arthritis of elbow
- M05.43Rheumatoid myopathy with rheumatoid arthritis of wrist
- M05.44Rheumatoid myopathy with rheumatoid arthritis of hand
- M05.45Rheumatoid myopathy with rheumatoid arthritis of hip
- M05.46Rheumatoid myopathy with rheumatoid arthritis of knee
- M05.47Rheumatoid myopathy with rheumatoid arthritis of ankle and foot
- M05.49Rheumatoid myopathy with rheumatoid arthritis of multiple sitesBillable
- M05.5Rheumatoid polyneuropathy with rheumatoid arthritis
- M05.50Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified siteBillable
- M05.51Rheumatoid polyneuropathy with rheumatoid arthritis of shoulder
- M05.52Rheumatoid polyneuropathy with rheumatoid arthritis of elbow
- M05.53Rheumatoid polyneuropathy with rheumatoid arthritis of wrist
- M05.54Rheumatoid polyneuropathy with rheumatoid arthritis of hand
- M05.55Rheumatoid polyneuropathy with rheumatoid arthritis of hip
- M05.56Rheumatoid polyneuropathy with rheumatoid arthritis of knee
- M05.57Rheumatoid polyneuropathy with rheumatoid arthritis of ankle and foot
- M05.59Rheumatoid polyneuropathy with rheumatoid arthritis of multiple sitesBillable
- M05.6Rheumatoid arthritis with involvement of other organs and systems
- M05.60Rheumatoid arthritis of unspecified site with involvement of other organs and systemsBillable
- M05.61Rheumatoid arthritis of shoulder with involvement of other organs and systems
- M05.62Rheumatoid arthritis of elbow with involvement of other organs and systems
- M05.63Rheumatoid arthritis of wrist with involvement of other organs and systems
- M05.64Rheumatoid arthritis of hand with involvement of other organs and systems
- M05.65Rheumatoid arthritis of hip with involvement of other organs and systems
- M05.66Rheumatoid arthritis of knee with involvement of other organs and systems
- M05.67Rheumatoid arthritis of ankle and foot with involvement of other organs and systems
- M05.671Rheumatoid arthritis of right ankle and foot with involvement of other organs and systemsBillable
- M05.672Rheumatoid arthritis of left ankle and foot with involvement of other organs and systemsBillable
- M05.679Rheumatoid arthritis of unspecified ankle and foot with involvement of other organs and systemsBillable
- M05.69Rheumatoid arthritis of multiple sites with involvement of other organs and systemsBillable
- M05.7Rheumatoid arthritis with rheumatoid factor without organ or systems involvement
- M05.70Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvementBillable
- M05.71Rheumatoid arthritis with rheumatoid factor of shoulder without organ or systems involvement
- M05.711Rheumatoid arthritis with rheumatoid factor of right shoulder without organ or systems involvementBillable
- M05.712Rheumatoid arthritis with rheumatoid factor of left shoulder without organ or systems involvementBillable
- M05.719Rheumatoid arthritis with rheumatoid factor of unspecified shoulder without organ or systems involvementBillable
- M05.72Rheumatoid arthritis with rheumatoid factor of elbow without organ or systems involvement
- M05.721Rheumatoid arthritis with rheumatoid factor of right elbow without organ or systems involvementBillable
- M05.722Rheumatoid arthritis with rheumatoid factor of left elbow without organ or systems involvementBillable
- M05.729Rheumatoid arthritis with rheumatoid factor of unspecified elbow without organ or systems involvementBillable
- M05.73Rheumatoid arthritis with rheumatoid factor of wrist without organ or systems involvement
- M05.731Rheumatoid arthritis with rheumatoid factor of right wrist without organ or systems involvementBillable
- M05.732Rheumatoid arthritis with rheumatoid factor of left wrist without organ or systems involvementBillable
- M05.739Rheumatoid arthritis with rheumatoid factor of unspecified wrist without organ or systems involvementBillable
- M05.74Rheumatoid arthritis with rheumatoid factor of hand without organ or systems involvement
- M05.741Rheumatoid arthritis with rheumatoid factor of right hand without organ or systems involvementBillable
- M05.742Rheumatoid arthritis with rheumatoid factor of left hand without organ or systems involvementBillable
- M05.749Rheumatoid arthritis with rheumatoid factor of unspecified hand without organ or systems involvementBillable
- M05.75Rheumatoid arthritis with rheumatoid factor of hip without organ or systems involvement
- M05.751Rheumatoid arthritis with rheumatoid factor of right hip without organ or systems involvementBillable
- M05.752Rheumatoid arthritis with rheumatoid factor of left hip without organ or systems involvementBillable
- M05.759Rheumatoid arthritis with rheumatoid factor of unspecified hip without organ or systems involvementBillable
- M05.76Rheumatoid arthritis with rheumatoid factor of knee without organ or systems involvement
- M05.761Rheumatoid arthritis with rheumatoid factor of right knee without organ or systems involvementBillable
- M05.762Rheumatoid arthritis with rheumatoid factor of left knee without organ or systems involvementBillable
- M05.769Rheumatoid arthritis with rheumatoid factor of unspecified knee without organ or systems involvementBillable
- M05.77Rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement
- M05.771Rheumatoid arthritis with rheumatoid factor of right ankle and foot without organ or systems involvementBillable
- M05.772Rheumatoid arthritis with rheumatoid factor of left ankle and foot without organ or systems involvementBillable
- M05.779Rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot without organ or systems involvementBillable
- M05.79Rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvementBillable
- M05.7ARheumatoid arthritis with rheumatoid factor of other specified site without organ or systems involvementBillable
- M05.8Other rheumatoid arthritis with rheumatoid factor
- M05.80Other rheumatoid arthritis with rheumatoid factor of unspecified siteBillable
- M05.81Other rheumatoid arthritis with rheumatoid factor of shoulder
- M05.82Other rheumatoid arthritis with rheumatoid factor of elbow
- M05.83Other rheumatoid arthritis with rheumatoid factor of wrist
- M05.84Other rheumatoid arthritis with rheumatoid factor of hand
- M05.85Other rheumatoid arthritis with rheumatoid factor of hip
- M05.86Other rheumatoid arthritis with rheumatoid factor of knee
- M05.87Other rheumatoid arthritis with rheumatoid factor of ankle and foot
- M05.89Other rheumatoid arthritis with rheumatoid factor of multiple sitesBillable
- M05.8AOther rheumatoid arthritis with rheumatoid factor of other specified siteBillable
- M05.9Rheumatoid arthritis with rheumatoid factor, unspecifiedBillable
- M05.AAbnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritisBillable
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to M05.
Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Codes whose notes reference M05
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about M05
Is M05 billable?
- No. M05 is a header code. Report one of its more specific subcodes instead.