2026 ICD-10-CM Diagnosis Code M90.821Osteopathy in diseases classified elsewhere, right upper arm

ICD-10-CM Codes›M00–M99›M86-M90›M90

ICD-10-CM M90.821
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M90.821 is a billable ICD-10-CM diagnosis code for osteopathy in diseases classified elsewhere, right upper arm. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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
M90.821
Billable Status
Yes — Valid for Submission
Code Describes
Osteopathy in diseases classified elsewhere, right upper arm
Short Description
Osteopathy in diseases classified elsewhere, right upper arm
Same as the full description in the CMS dataset.
Parent Code
M90.82
Osteopathy in diseases classified elsewhere, upper arm

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM90Osteopathies in diseases classified elsewhere
This CodeM90.821Osteopathy in diseases classified elsewhere, right upper arm

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M90.821.

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.

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

Bone Diseases

Your bones help you move, give you shape and support your body. They are living tissues that rebuild constantly throughout your life. During childhood and your teens, your body adds new bone faster than it removes old bone. After about age 20, you can lose bone faster than you make bone.

Read the full article at MedlinePlus

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

Convert M90.821 to ICD-9-CMHistory

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

ICD-9-CM
730.82 Bone infect NEC-up/arm
Approximate The match is approximate rather than exact.
ICD-9-CM
731.8 Bone involv 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M90.821Overview

Is M90.821 (Osteopathy in diseases classified elsewhere, upper arm) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report osteopathy in diseases classified elsewhere, right upper arm on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M90.821 group to?

On inpatient claims, osteopathy in diseases classified elsewhere, right upper arm maps to MS-DRG 553, 554, with relative weights from 0.8301 to 1.2963 depending on complications. Higher weights mean higher Medicare reimbursement.

Can M90.821 be a principal diagnosis?

No. This is a manifestation code: osteopathy in diseases classified elsewhere, right upper arm describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of M90.821?

Under the General Equivalence Mappings, osteopathy in diseases classified elsewhere, right upper arm converts to ICD-9-CM 730.82 (bone infect NEC-up/arm) and 731.8 (bone involv in oth dis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.