E56.9 Vitamin deficiency, unspecified

Billable ICD-10-CM code, FY2026.

Applies from E56 Other vitamin deficiencies

Excludes1 (never code together)

• sequelae of other vitamin deficiencies (E64.8)

MS-DRG index

Defines the logic of DRG(s) 640-641 in MDC 10.

Approximate ICD-9-CM (GEMs)

• 269.2 Unspecified vitamin deficiency (approximate)

Code annotations containing back-references to E56.9

Back-references to E56

• Code First: G63 Polyneuropathy in diseases classified elsewhere ("nutritional deficiency (E40-E64)")
• Code First: G99.8 Other specified disorders of nervous system in diseases classified elsewhere ("avitaminosis (E56.-)")
• Type 1 Excludes: T45.2X6 Underdosing of vitamins ("vitamin deficiencies (E50-E56)")
• Type 1 Excludes: Z72.4 Inappropriate diet and eating habits ("malnutrition and other nutritional deficiencies (E40-E64)")

Diagnosis Index entries for E56.9

• Avitaminosis (multiple)
• Deficiency, deficient › vitamin (multiple) NOS
• Encephalopathy (acute) › in (due to) (with) › lack of vitamin
• Neuroavitaminosis
• Polyneuritis, polyneuritic › due to lack of vitamin NEC
• Polyneuropathy (peripheral) › in (due to) › avitaminosis NEC
• Polyneuropathy (peripheral) › in (due to) › lack of vitamin NEC

Nearby codes

• E56 Other vitamin deficiencies
• E56.0 Deficiency of vitamin E
• E56.1 Deficiency of vitamin K
• E56.8 Deficiency of other vitamins
• E56.9 Vitamin deficiency, unspecified (this code)