M02.312

HCC Category Mapping

What This Code Means

Reiter's disease is a type of reactive arthritis that causes joint inflammation, typically affecting the left shoulder in this case. It usually develops after a bacterial infection elsewhere in the body.

Coding Tips

• •Reiter's disease is now more commonly called reactive arthritis; verify documentation uses either term
• •The fifth character specifies laterality (left=2); ensure correct side is documented before coding

Clinical Significance

This code identifies Reiter's disease specifically affecting the left shoulder, representing reactive arthritis that can significantly impact shoulder function and upper extremity mobility. The condition typically develops following an infectious trigger and requires chronic management due to its inflammatory nature and potential for recurrent episodes.

Documentation Requirements

• ✓Clinical diagnosis of Reiter's disease or reactive arthritis established
• ✓Left shoulder joint involvement specifically identified
• ✓History of preceding infection documented
• ✓Evidence of shoulder arthritis with functional impairment
• ✓Documentation of other Reiter's triad components when present
• ✓Chronic or recurrent pattern of shoulder symptoms
• ✓Physical findings consistent with inflammatory shoulder arthropathy

Commonly Confused Codes