2027 ICD-10-CM Diagnosis Code M85.522Aneurysmal bone cyst, left upper arm
ICD-10-CM Codes›M00–M99›M80-M85›M85
- Billable — Valid for Submission
- Not Chronic
M85.522 is a billable ICD-10-CM diagnosis code for aneurysmal bone cyst, left upper arm. 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. Coders also document this condition as aneurysmal bone cyst of humerus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aneurysmal bone cyst of humerus
- Aneurysmal bone cyst of left humerus
- Benign neoplasm of humerus
- Benign neoplasm of long bone of left upper limb
- Bone cyst of humerus
- Bone cyst of left humerus
- Neoplasm of left humerus
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M85.522: its own notes plus those printed at M85.5, M85, 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.
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.
- 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)
Notes
General instructions on how these codes are used.
- 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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Bone Cysts, Aneurysmal
fibrous blood-filled cyst in the bone. although benign it can be destructive causing deformity and fractures.
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 M85.522 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M85.522Overview
What is the ICD-10 code for aneurysmal bone cyst, left upper arm?
The ICD-10-CM code for aneurysmal bone cyst, left upper arm is M85.522 (sometimes written as M85522). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M85.522 (Aneurysmal bone cyst, upper arm) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report aneurysmal bone cyst, left upper arm on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M85.522 group to?
When aneurysmal bone cyst, left upper arm is the principal diagnosis on an inpatient stay, it groups to MS-DRG 554, 553, with relative weights from 0.8328 to 1.2492 depending on complications. Higher weights mean higher Medicare reimbursement.
Can M85.522 be reported with Q78.0?
Not as a rule. The Excludes1 note at M85, which applies to M85.522, lists "osteogenesis imperfecta (Q78.0)". 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).
What is the ICD-9 equivalent of M85.522?
Under the General Equivalence Mappings, aneurysmal bone cyst, left upper arm converts to ICD-9-CM 733.22 (aneurysmal bone cyst). The mapping is approximate, so confirm the match fits the documentation.
