Softening of bone in adults caused by impaired nutrient absorption in the gastrointestinal tract, including postsurgical malabsorption states, leading to deficient mineralization.
Verified May 8, 2026 · 4 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 10
- Region
- General
Documentation tips
What should appear in the chart to support M83.2.
Source · Editorial brief grounded in 4 cited references ↓
- Document the specific malabsorptive mechanism — e.g., 'status post Roux-en-Y gastric bypass with documented calcium and vitamin D malabsorption' — to support M83.2 over the unspecified M83.9.
- Record lab values that confirm deficient mineralization: serum 25-hydroxyvitamin D, calcium, phosphorus, and alkaline phosphatase levels all strengthen audit defense.
- If imaging (DEXA, plain film, or MRI) shows low bone density or insufficiency fractures, document the specific findings and tie them to the malabsorptive etiology in the assessment.
- Note the underlying GI diagnosis (e.g., celiac disease K90.0, history of bariatric surgery Z98.84) as a secondary code to establish clinical context.
- Confirm patient age is 15 or older; M83.2 carries an adult-only age restriction (15–124 years) in the ICD-10-CM tabular.
Related CPT procedures
Procedure codes commonly billed with M83.2. Linking the right diagnosis to the right procedure is what establishes medical necessity.
Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis
Common coding pitfalls
The recurring mistakes coders make with M83.2 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Coding K91.2 (postsurgical malabsorption, NEC) alongside M83.2 violates the Type 1 Excludes at K91.2 — these two codes cannot appear together on the same claim.
- Defaulting to M83.9 (unspecified adult osteomalacia) when the chart clearly documents a malabsorptive cause; M83.2 is the more specific and correct code.
- Using E83.31 for vitamin D-related osteomalacia without confirming it is the hereditary, phosphate-wasting form — nutritional or malabsorptive vitamin D deficiency leading to osteomalacia belongs under M83.2, not E83.31.
- Conflating M83.2 with M83.3; malnutrition (insufficient dietary intake) is M83.3, while malabsorption (failure to absorb despite intake) is M83.2 — the chart must specify the mechanism.
- Applying M83.2 to pediatric patients: this code is restricted to adults 15 and older; pediatric or juvenile osteomalacia maps to E55.0.
Clinical context
Source · Editorial summary grounded in 4 cited references ↓
M83.2 applies to adults (ages 15–124) who develop osteomalacia as a direct consequence of malabsorption — most commonly following bariatric surgery, small bowel resection, celiac disease, or other conditions that impair calcium and vitamin D uptake. The ICD-10-CM tabular note explicitly includes 'postsurgical malabsorption osteomalacia in adults' as an applicable term for this code, making it the correct choice after procedures like Roux-en-Y gastric bypass when bone demineralization is documented.
Do not confuse M83.2 with M83.3 (osteomalacia due to malnutrition — nutritional deficiency without a malabsorptive mechanism), M83.9 (unspecified adult osteomalacia), or the excluded vitamin D-resistant osteomalacia (E83.31), which is a hereditary phosphate-wasting disorder. The parent category M83 carries Type 1 Excludes notes barring use when the underlying condition is infantile/juvenile osteomalacia (E55.0), renal osteodystrophy (N25.0), or vitamin D-resistant disease (E83.31).
Also note the reciprocal Type 1 Excludes at K91.2 (postsurgical malabsorption, not elsewhere classified): you cannot report K91.2 and M83.2 together on the same claim. When malabsorption-related bone disease is the reason for the orthopedic encounter, M83.2 is the principal or primary diagnosis; code the underlying GI condition secondarily if it adds specificity.
Inclusion & exclusion notes
Per the official ICD-10-CM Tabular List.
Source · CDC ICD-10-CM Official Tabular List · 2026
Includes
- Postsurgical malabsorption osteomalacia in adults
Sibling codes
Other billable codes under M83 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 4 cited references ↓
01Can M83.2 be used after bariatric surgery even if no fracture is present?
02What is the difference between M83.2 and M83.3?
03Can K91.2 and M83.2 be reported together?
04Is M83.2 valid for a patient with celiac disease causing vitamin D malabsorption?
05Does vitamin D-resistant osteomalacia code to M83.2?
06What secondary codes should accompany M83.2?
07Is M83.2 age-restricted?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 (effective Oct 1, 2025)
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M80-M85/M83-/M83.2
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M83.2
- 04icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M80-M85/M83-
Mira AI Scribe
Mira's AI scribe captures the malabsorptive mechanism from the encounter note — surgery history (e.g., gastric bypass, bowel resection), active GI diagnosis, or documented absorption-related lab abnormalities — and links it to the bone diagnosis. That specificity keeps the claim at M83.2 rather than falling back to M83.9 (unspecified), preventing undercoding that can trigger medical necessity denials on DEXA or infusion claims.
See how Mira captures M83.2 documentation