Palindromic rheumatism, unspecified site

This code signifies a diagnosis of palindromic rheumatism, an inflammatory arthritis characterized by recurrent, self-limiting episodes of joint pain and swelling. These attacks typically resolve completely within hours to days, with symptom-free intervals between episodes. It is considered a precursor to rheumatoid arthritis in many cases.

Use this code when the physician documents a diagnosis of palindromic rheumatism without specifying the affected anatomical site. This is appropriate when the patient presents with migratory arthralgia and swelling consistent with the condition, and the specific joint(s) involved are not detailed or are multiple and transient. Documentation should clearly state "palindromic rheumatism."

• Do not use this code if a specific joint or anatomical site is documented; instead, use a more specific code from the M12.3- subcategory.
• Consider coding any associated conditions, such as seropositivity for rheumatoid factor (R76.0) or anti-CCP antibodies (R76.8), if documented.
• This code is often used as an initial diagnosis while monitoring for progression to rheumatoid arthritis.