R62.51 Failure to thrive (child)

Billable ICD-10-CM code, FY2026.

Applicable to

• Failure to gain weight
• Faltering growth

Excludes1 (never code together)

• failure to thrive in child under 28 days old (P92.6)

Applies from R62 Lack of expected normal physiological development in childhood and adults

Excludes1 (never code together)

• delayed puberty (E30.0)
• gonadal dysgenesis (Q99.1)
• hypopituitarism (E23.0)

Applies from R62.5 Other and unspecified lack of expected normal physiological development in childhood

Excludes1 (never code together)

• HIV disease resulting in failure to thrive (B20)
• physical retardation due to malnutrition (E45)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 783.41 Failure to thrive

Medicare Code Edits (MCE v43.1 (April 2026))

• Pediatric diagnoses (age 0 through 17): Age conflict edit. These diagnoses are clinically expected only in patients age 0 through 17.

Code annotations containing back-references to R62.51

Back-references to R62.51

• Type 2 Excludes: E63 Other nutritional deficiencies ("failure to thrive, child (R62.51)")
• Type 2 Excludes: E88.A Wasting disease (syndrome) due to underlying condition ("failure to thrive (R62.51, R62.7)")
• Type 1 Excludes: P92.6 Failure to thrive in newborn ("failure to thrive in child over 28 days old (R62.51)")

Diagnosis Index entries for R62.51

• Failure, failed › gain weight (child over 28 days old)
• Failure, failed › to thrive (child over 28 days old)
• Faltering growth
• Lack of › development (physiological) › failure to thrive (child over 28 days old)

Nearby codes

• R62 Lack of expected normal physiological development in childhood and adults
• R62.0 Delayed milestone in childhood
• R62.5 Other and unspecified lack of expected normal physiological development in childhood
• R62.50 Unspecified lack of expected normal physiological development in childhood
• R62.51 Failure to thrive (child) (this code)
• R62.52 Short stature (child)
• R62.59 Other lack of expected normal physiological development in childhood
• R62.7 Adult failure to thrive