Other cyst of bone affecting multiple anatomical sites simultaneously, not classifiable to a single skeletal location.
Verified May 8, 2026 · 4 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 9
- Region
- Multi-region
Documentation tips
What should appear in the chart to support M85.69.
Source · Editorial brief grounded in 4 cited references ↓
- Name every distinct skeletal site involved — 'multiple bone cysts' alone is insufficient; list each bone by name and laterality.
- Reference the imaging modality (X-ray, MRI, CT, bone scan) and findings at each site that confirm cystic morphology (fluid-filled cavity, sclerotic border, no soft tissue mass).
- Distinguish the cyst type in the note: simple/unicameral, intraosseous ganglion, or 'other' — this supports M85.6x over M85.5 (aneurysmal) and M85.0x (fibrous dysplasia).
- Document that jaw cysts are absent or code jaw cysts separately under K09.2 — the Tabular List explicitly excludes jaw from M85.6x.
- Record prior treatment history (aspiration, steroid injection, curettage) per site if applicable, as this establishes medical necessity for repeat imaging or intervention.
Related CPT procedures
Procedure codes commonly billed with M85.69. 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 M85.69 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Using M85.69 when cysts are bilateral at a single joint (e.g., both distal femora) — bilateral involvement of one region does not equal multiple sites; use the site-specific unspecified-laterality code instead.
- Conflating M85.69 with M85.68 (other site, singular) when only one non-listed anatomical site is involved — M85.69 requires explicit documentation of more than one skeletal site.
- Failing to exclude aneurysmal bone cyst (M85.5) before assigning M85.69 — aneurysmal cysts have a distinct code regardless of site count.
- Coding jaw cysts under M85.69 when K09.2 is required per the ICD-10-CM tabular exclusion note.
- Defaulting to M85.69 when site is simply unspecified — use M85.60 (unspecified site) if the record lacks site detail, not the multiple-sites code.
Clinical context
Source · Editorial summary grounded in 4 cited references ↓
M85.69 is the correct code when a patient presents with non-aneurysmal, non-solitary bone cysts documented at more than one distinct skeletal site. This includes simple (unicameral) bone cysts and other benign osseous cysts that don't fit the more specific subcategories under M85.6 — such as aneurysmal bone cyst (M85.5) or fibrous dysplasia (M85.0). The multiple-site qualifier is what separates M85.69 from M85.68 (other single site) and the site-specific bilateral or unilateral codes within M85.60–M85.67.
Common clinical scenarios include incidental findings on skeletal survey showing cystic lesions at two or more bones, or a patient with a known systemic skeletal condition (e.g., fibrous dysplasia excluded by coding rules) who has documented cysts spanning different anatomical regions. Bone cysts captured here are distinct from jaw cysts (K09.2) and from cysts that meet criteria for neoplastic or metabolic etiologies coded elsewhere.
Do not use M85.69 when cysts are limited to a single anatomical region — even bilaterally — unless the documentation explicitly describes involvement of multiple distinct skeletal sites. If documentation names only one site, use the appropriate site-specific child code under M85.60–M85.68. Reserve M85.69 for genuinely multi-site involvement as confirmed by imaging or operative findings.
Sibling codes
Other billable codes under M85.6 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 4 cited references ↓
01What distinguishes M85.69 from M85.68?
02Can I use M85.69 for bilateral bone cysts at the same anatomical region?
03Should aneurysmal bone cysts at multiple sites be coded M85.69?
04What imaging documentation supports M85.69 for audit purposes?
05Is M85.69 used when a jaw cyst is one of the multiple sites?
06Does M85.69 require a 7th character extension?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 (FY2026, effective October 1, 2025)
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M80-M85/M85-/M85.69
- 03icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M80-M85/M85-
- 04classbrowser.nhs.ukhttps://classbrowser.nhs.uk/ref_books/ICD-10_2025_5th_Ed_NCCS.pdf
Mira AI Scribe
Mira AI Scribe captures the name and laterality of each bone site with documented cystic lesions, the imaging modality and key findings (fluid signal, sclerotic margins, no periosteal reaction), cyst type characterization, and any prior treatment per site. This prevents assignment of the single-site or unspecified-site codes (M85.68, M85.60) when multi-site involvement is the clinical reality — avoiding a specificity downgrade that can trigger payer documentation requests.
See how Mira captures M85.69 documentation