ICDcodes.org
FY2027

M89.79 — Major osseous defect, multiple sites

Billable

Is M89.79 billable?

Yes — M89.79 is billable for FY2027. M89.79 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. M89.79 may be submitted for encounters from October 1, 2026 through September 30, 2027.

M89.79 at a glance

CodeM89.79
DescriptionMajor osseous defect, multiple sites
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does M89.79 group to?

M89.79 sits in MDC 08 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 553Bone Diseases and Arthropathies with MCCmedical
  • 554Bone Diseases and Arthropathies without MCCmedical

How is M89.79 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to M89.79. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Defect, defective › major osseous › multiple sites

Excludes1 — never code together — inherited from M86-M90

The conditions below can never be reported together with M89.79 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • postprocedural osteopathies (M96.-)

Code first — inherited from M89.7

The underlying condition below must be sequenced before M89.79. M89.79 describes a manifestation and cannot be the principal or first-listed diagnosis.

  • underlying disease, if known, such as:
  • aseptic necrosis of bone (M87.-)
  • malignant neoplasm of bone (C40.-)
  • osteolysis (M89.5-)
  • osteomyelitis (M86.-)
  • osteonecrosis (M87.-)
  • osteoporosis (M80.-, M81.-)
  • periprosthetic osteolysis (T84.05-)

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M89.79, but a patient may have both at the same time. When documentation supports it, M89.79 and the excluded code may both 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)

How long has M89.79 existed?

M89.79 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which conditions are coded to M89.79?

What other codes are in the M89.7 family? (9)