D51.1
Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria
D51.1 (also written D511) is a billable ICD-10-CM diagnosis code for vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 6 codes in category D51 (Vitamin B12 deficiency anemia). The Alphabetic Index lists it under 4 entries. Its coding notes include 10 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (9 notes)
- autoimmune disease (systemic) NOS (M35.9)
- certain conditions originating in the perinatal period (P00-P96)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- human immunodeficiency virus [HIV] disease (B20)
- 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)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Inclusion terms
Conditions classified to this code.
- Imerslund (Gräsbeck) syndrome
- Megaloblastic hereditary anemia
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 4 entries
- Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound), deficiency, vitamin B12 NOS, due to, selective vitamin B12 malabsorption with proteinuria
- Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound), due to (in) (with), selective vitamin B12 malabsorption with proteinuria
- Anemia (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound), megaloblastic, hereditary
- Imerslund (-Gräsbeck) syndrome