2027 ICD-10-CM Diagnosis Code M90.671Osteitis deformans in neoplastic diseases, right ankle and foot

ICD-10-CM Codes›M00–M99›M86-M90›M90

ICD-10-CM M90.671
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M90.671 is a billable ICD-10-CM diagnosis code for osteitis deformans in neoplastic diseases, right ankle and foot. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 553 through 554. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.

Code Identity

ICD-10-CM Code
M90.671
Billable Status
Yes — Valid for Submission
Code Describes
Osteitis deformans in neoplastic diseases, right ankle and foot
Short Description
Osteitis deformans in neoplastic diseases, right ank/ft
Parent Code
M90.67
Osteitis deformans in neoplastic diseases, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM90Osteopathies in diseases classified elsewhere
This CodeM90.671Osteitis deformans in neoplastic diseases, right ankle and foot

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M90.671.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M90.671: its own notes plus those printed at M90.6, M90, block M86-M90, and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From M90.6 Osteitis deformans in neoplastic diseases applies to 24 codes
  • osteitis deformans [Paget's disease of bone] (M88.-)
From M90 Osteopathies in diseases classified elsewhere applies to 72 codes
  • osteochondritis, osteomyelitis, and osteopathy (in):
  • cryptococcosis (B45.3)
  • diabetes mellitus (E08-E13 with .69-)
  • gonococcal (A54.43)
  • neurogenic syphilis (A52.11)
  • renal osteodystrophy (N25.0)
  • salmonellosis (A02.24)
  • secondary syphilis (A51.46)
  • syphilis (late) (A52.77)
From Block M86-M90 Other osteopathies applies to 732 codes
  • postprocedural osteopathies (M96.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code First

The underlying condition named in the note is sequenced before this code.

From M90.6 Osteitis deformans in neoplastic diseases applies to 24 codes

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M90.671, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming M90.671: they are not reported together with it, unless the two conditions are unrelated.

  • M88 Osteitis deformans [Paget's disease of bone]
    osteitis deformans in neoplastic disease (M90.6) names M90.6, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS028
Other specified bone disease and musculoskeletal deformities
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Paget's Disease of Bone

Paget's disease of bone is a chronic bone disorder. Normally, there is a process in which your bones break down and then regrow. In Paget's disease, this process is abnormal. There is excessive breakdown and regrowth of bone. Because the bones regrow too quickly, they are bigger and softer than normal.

The full article covers:

  • What is Paget's disease of bone?
  • What causes Paget's disease of bone?
  • Who is at risk for Paget's disease of bone?
  • What are the symptoms of Paget's disease of bone?
  • What other problems can Paget's disease of bone cause?
  • How is Paget's disease of bone diagnosed?
  • What are the treatments for Paget's disease of bone?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M90.671 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
731.1 Osteitis def in oth dis
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M90.671Overview

What is the ICD-10 code for osteitis deformans in neoplastic diseases, right ankle and foot?

The ICD-10-CM code for osteitis deformans in neoplastic diseases, right ankle and foot is M90.671 (sometimes written as M90671). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M90.671 (Osteitis deformans in neoplastic diseases, ankle and foot) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report osteitis deformans in neoplastic diseases, right ankle and foot on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does M90.671 group to?

On inpatient claims, osteitis deformans in neoplastic diseases, right ankle and foot maps to MS-DRG 554, 553, with relative weights from 0.8328 to 1.2492 depending on complications. Higher weights mean higher Medicare reimbursement.

Can M90.671 be a principal diagnosis?

No. This is a manifestation code: osteitis deformans in neoplastic diseases, right ankle and foot describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

Can M90.671 be reported with a code from M88?

Not as a rule. The Excludes1 note at M90.6, which applies to M90.671, lists "osteitis deformans [Paget's disease of bone] (M88.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).