2027 ICD-10-CM Diagnosis Code M89.70Major osseous defect, unspecified site
ICD-10-CM Codes›M00–M99›M86-M90›M89
- Billable — Valid for Submission
- Not Chronic
M89.70 is a billable ICD-10-CM diagnosis code for major osseous defect, unspecified site. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.
Code Identity
Code Classification
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M89.70: its own notes plus those printed at M89.7, 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.
- 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.
- 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.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name M89.70, its category, or a range that includes it.
Use Additional Code 7
These codes say to use an additional code from the note, and M89.70 is one of the codes named.
- C40 Malignant neoplasm of bone and articular cartilage of limbscode to identify major osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
- M80 Osteoporosis with current pathological fracturecode to identify major osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
- M81 Osteoporosis without current pathological fracturemajor osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
- M86 Osteomyelitiscode to identify major osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
- M87 Osteonecrosiscode to identify major osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
- M89.5 Osteolysiscode to identify major osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
- T84.05 Periprosthetic osteolysis of internal prosthetic jointcode to identify major osseous defect, if applicable (M89.7-) names M89.7-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
major osseous M89.70
osseous, major M89.70
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 M89.70 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M89.70Overview
What is the ICD-10 code for major osseous defect, unspecified site?
The ICD-10-CM code for major osseous defect, unspecified site is M89.70 (sometimes written as M8970). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M89.70 (Major osseous defect) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report major osseous defect, unspecified site on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M89.70 group to?
When major osseous defect, unspecified site 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 M89.70 be reported with a code from M96?
Not as a rule. The Excludes1 note at block M86-M90, which applies to M89.70, lists "postprocedural osteopathies (M96.-)". 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 coded first with M89.70?
The Code First note at M89.7, which applies to M89.70, reads: underlying disease, if known, such as: aseptic necrosis of bone (M87.-); malignant neoplasm of bone (C40.-); osteolysis (M89.5-); osteomyelitis (M86.-); osteonecrosis (M87.-); and 2 more listed in the Instructional Notes section. When one of these applies, it is sequenced before M89.70.
