M85.00
Billable codeFibrous dysplasia (monostotic), unspecified site
The ICD-10 code for fibrous dysplasia (monostotic), unspecified site is M85.00.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- M85.01Fibrous dysplasia (monostotic), shouldernon-billable header
- M85.02Fibrous dysplasia (monostotic), upper armnon-billable header
- M85.03Fibrous dysplasia (monostotic), forearmnon-billable header
- M85.04Fibrous dysplasia (monostotic), handnon-billable header
- M85.05Fibrous dysplasia (monostotic), thighnon-billable header
- M85.06Fibrous dysplasia (monostotic), lower legnon-billable header
- M85.07Fibrous dysplasia (monostotic), ankle and footnon-billable header
- M85.08Fibrous dysplasia (monostotic), other site
- M85.09Fibrous dysplasia (monostotic), multiple sites
- M85.00Fibrous dysplasia (monostotic), unspecified site
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 73329Approximate match
Associated MS-DRGs
M85.00 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.