M93.89

M93.89 captures other specified osteochondropathies that affect multiple anatomical sites simultaneously, where the condition doesn't fit a single-site code and isn't classifiable as osteochondrosis of the spine.

Verified May 8, 2026 · 5 sources ↓

Status: Billable
Chapter: 13
Related CPT: 5
Region: Multi-region

Drawn from CDCICD10DataAAPCAAOSLouisianahealthconnect

Documentation tips

What should appear in the chart to support M93.89.

Source · Editorial brief grounded in 5 cited references ↓

Name every affected site explicitly in the note — 'multiple sites' on its own won't survive audit; document each joint or region involved.
Specify the type of osteochondropathy (e.g., osteochondritis dissecans, avascular necrosis variant, Freiberg) to justify 'other specified' over the unspecified M93.9x category.
Note imaging findings per site: MRI signal changes, subchondral bone involvement, fragmentation, or loose body formation that confirm osteochondropathy at each location.
Document prior conservative treatment history if the encounter supports surgical planning — payers may require it for procedures like osteochondral grafting.
Confirm the spine is not the involved region; if spinal osteochondrosis coexists, assign M42.- separately per the Excludes2 guidance.

Related CPT procedures

Procedure codes commonly billed with M93.89. Linking the right diagnosis to the right procedure is what establishes medical necessity.

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

29867 $1,178.72

Arthroscopic surgical transplantation of donor (allograft) osteochondral tissue into a damaged articular cartilage surface of the knee joint.

29868 $1,512.39

Arthroscopic knee surgery for transplantation of a donor meniscus, medial or lateral, including the required arthrotomy for graft insertion.

27570 $149.97

Manipulation of the knee joint performed under general anesthesia, including application of traction or other fixation devices as needed to restore range of motion.

73221 $205.08

MRI of any upper extremity joint — shoulder, elbow, or wrist — performed without contrast material.

73721 $204.41

MRI of a lower extremity joint (hip, knee, or ankle) performed without contrast material.

Common coding pitfalls

The recurring mistakes coders make with M93.89 and adjacent codes.

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

Using M93.89 when only one site is affected — always check for the site-specific M93.8x laterality code before defaulting to the multiple-sites code.
Confusing 'other specified' with 'unspecified' — if the osteochondropathy type isn't named in the documentation, M93.9x is correct, not M93.89.
Failing to add a separate M42.- code when spinal osteochondrosis coexists; the Excludes2 note means both can and should be reported.
Applying M93.89 to postprocedural cartilage conditions — those fall under M96.- per the section-level Type 1 Excludes on the chondropathies block.
Not linking each affected site to supporting imaging or clinical findings, leaving the 'multiple sites' claim unsupported during payer review.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Use M93.89 when a patient presents with a named or specified osteochondropathy — such as osteochondritis dissecans, Kienböck disease, or Freiberg infraction — that involves two or more distinct anatomical sites and no single-site M93.8x code covers the full clinical picture. The 'other specified' qualifier means the clinician has identified a distinct osteochondropathy type; this is not a catch-all for vague joint complaints.

M93.89 sits under parent code M93.8 (Other specified osteochondropathies) within the M93 category. The category-level Excludes2 note bars osteochondrosis of the spine (M42.-) — those conditions are coded separately and can coexist. Because the chondropathies block (M91–M94) also excludes postprocedural chondropathies (M96.-), don't use M93.89 for cartilage breakdown attributable to a prior surgical procedure.

When only one site is affected, use the site-specific M93.8x code (e.g., M93.861–M93.869 for ankle/foot, M93.821–M93.829 for upper arm). If the osteochondropathy type is truly unknown or unspecified, M93.9x (Osteochondropathy, unspecified) is the correct fallback — not M93.89. Reserve M93.89 for encounters where the provider has named the condition and documented involvement at multiple sites.

Sibling codes

Other billable codes under M93.8 (laterality / anatomic variants).

M93.80

Other specified osteochondropathies of unspecified site

M93.88

Other specified osteochondropathies other

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01When should I use M93.89 instead of a single-site M93.8x code?

Use M93.89 only when the documented osteochondropathy spans two or more distinct anatomical regions. If all involvement is at one site — even bilateral — select the site-specific M93.8x code with the appropriate laterality character.

02Can M93.89 and M42.- be reported together?

Yes. The M93 category carries an Excludes2 note for osteochondrosis of the spine (M42.-), meaning both conditions can coexist and both codes should be assigned when clinically documented.

03What's the difference between M93.89 and M93.9x?

M93.89 requires a named, specified osteochondropathy type affecting multiple sites. M93.9x applies when the type of osteochondropathy is unspecified. If the provider hasn't named the condition, M93.9x is the correct code — not M93.89.

04Does M93.89 require a 7th character extension?

No. M93.89 is a 5-character code in Chapter 13 (M-codes) and does not use 7th-character encounter extensions. Those extensions (A/D/S) apply to injury S-codes and select fracture codes, not osteochondropathy codes.

05Can M93.89 be used to support medical necessity for osteochondral grafting procedures?

M93.89 can support medical necessity when the osteochondropathy is named and multi-site involvement is documented with imaging. However, payers more commonly map osteochondral procedures (e.g., CPT 29867, 29868) to site-specific osteochondritis dissecans codes like M93.261–M93.269. Verify payer LCD/NCD requirements before relying solely on M93.89.

06Is M93.89 appropriate for postoperative cartilage deterioration at multiple sites?

No. Postprocedural chondropathies are excluded from the M91–M94 block via a Type 1 Excludes note pointing to M96.-. Use an M96.- code for cartilage conditions that are a direct result of a prior procedure.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira AI Scribe captures the name of the osteochondropathy, every anatomically distinct site involved, laterality per site, and imaging findings (MRI staging, subchondral changes, loose body presence) at each location. That specificity prevents downcode to unspecified M93.9x and blocks payer rejection for insufficient site documentation.

See how Mira captures M93.89 documentation