K91.2: Postsurgical malabsorption, not elsewhere classified
K91.2, postsurgical malabsorption, not elsewhere classified, is listed as a covered diagnosis in 4 Medicare billing and coding articles that apply to 3 HCPCS Level II codes, including J3420 (Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg), J3425 (Injection, hydroxocobalamin, intramuscular, 10 mcg), G0127 (Trimming of dystrophic nails, any number). The articles come from 3 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.
HCPCS Level II codes with K91.2 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| J3420 | Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg | Special coverage instructions apply | — | 1 |
| J3425 | Injection, hydroxocobalamin, intramuscular, 10 mcg | Special coverage instructions apply | — | 1 |
| G0127 | Trimming of dystrophic nails, any number | Special coverage instructions apply | — | 3 |
Medicare policy articles listing K91.2
- A57755: Billing and Coding: Vitamin B12 Injections (First Coast Service Options, Inc. (MAC - Part B); 2 Level II codes). LCD with the same title: L33967
- A57759: Billing and Coding: Routine Foot Care and Debridement of Nails (Wellpoint Federal (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L33636, L34246
- A57193: Billing and Coding: Routine Foot Care and Debridement of Nails (CGS Administrators, LLC (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L33636, L34246
- A57188: Billing and Coding: Routine Foot Care (First Coast Service Options, Inc. (MAC - Part B); 1 Level II codes). LCD with the same title: L33941, L35138, L37643
A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.
Other K91 diagnoses (Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified)
- K91.30 — Postprocedural intestinal obstruction, unspecified as to partial…
- K91.31 — Postprocedural partial intestinal obstruction
- K91.32 — Postprocedural complete intestinal obstruction
- K91.870 — Postprocedural hematoma of a digestive system organ or structure…
- K91.871 — Postprocedural hematoma of a digestive system organ or structure…
- K91.872 — Postprocedural seroma of a digestive system organ or structure…
- K91.873 — Postprocedural seroma of a digestive system organ or structure…
Frequently asked questions
Does Medicare cover K91.2 (Postsurgical malabsorption, not elsewhere classified)?
Medicare covers items and services, not diagnoses. 4 Medicare billing and coding articles list K91.2 as a covered diagnosis for 3 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.
Which HCPCS codes can be billed with ICD-10 K91.2?
The Level II codes from the policies most specific to this diagnosis are J3420 (Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg, 1 article); J3425 (Injection, hydroxocobalamin, intramuscular, 10 mcg, 1 article); G0127 (Trimming of dystrophic nails, any number, 3 articles). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list K91.2?
A57755 (Billing and Coding: Vitamin B12 Injections); A57759 (Billing and Coding: Routine Foot Care and Debridement of Nails); A57193 (Billing and Coding: Routine Foot Care and Debridement of Nails), and 1 more article.
What is ICD-10-CM code K91.2?
K91.2 is the ICD-10-CM code for postsurgical malabsorption, not elsewhere classified, in category K91 (Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified), chapter 11: Diseases of the digestive system.
Next steps
- Run a reimbursement report for a device billed under J3420
- Watch J3420 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for J3420
Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.
Chapter 11: Diseases of the digestive system · All diagnoses · HCPCS lookup