M71.08 identifies a purulent infection (abscess) of a bursa located at a site not captured by any other specific M71.0x subcode — meaning it falls outside the shoulder, elbow, wrist, hand, hip, knee, ankle, and foot laterality options in the M71.0 subcategory.

Documentation tips

What should appear in the chart to support M71.08.

Source · Editorial brief grounded in 4 cited references ↓

• Name the exact anatomical site of the bursa — 'chest wall bursa' or 'sacral bursa' is far more defensible than a generic body region description.
• Document the causative organism (e.g., Staphylococcus aureus, MRSA) so you can append B95.- or B96.- as required by the M71.0 use-additional-code instruction.
• Record clinical findings that confirm abscess rather than simple bursitis: fluctuance, purulent aspirate, elevated WBC, or positive culture result.
• If a traumatic mechanism or prior procedure preceded the infection, document it to support an external cause code.
• Note any imaging (ultrasound, MRI) that defines the fluid collection and confirms intrabursal location — this distinguishes the abscess from a cellulitis or soft-tissue abscess coded elsewhere.

Related CPT procedures

Procedure codes commonly billed with M71.08. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M71.08 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Using M71.08 for extremity bursal abscesses that have a designated site-specific subcode (e.g., elbow M71.02, knee M71.06) — always check the full M71.0 subcategory before defaulting to 'other site.'
• Omitting the required B95.- or B96.- organism code when the causative pathogen is documented; this is a compliance gap, not optional.
• Confusing a septic bursitis (non-purulent) with a true abscess — if frank pus is not confirmed, consider whether M71.1x (other infective bursitis) is more accurate.
• Coding M71.08 when the condition is actually bursitis from repetitive use or pressure, which maps to M70.- and is excluded from M71 by the Excludes1 note.
• Failing to add an external cause code when the abscess followed an injection or procedure, leaving an auditable documentation gap.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

Sibling codes

Other billable codes under M71.0 (laterality / anatomic variants).