ICD-10-CM 2027
ICD-10 code for gain weight failure
From the official ICD-10-CM alphabetic index entry “Failure, failed › gain weight (child over 28 days old)”. Page updated September 29, 2026.
About coding gain weight failure
The ICD-10-CM code for gain weight failure is R62.51 (Failure to thrive (child)). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R62.51.
Within R62.5 (other and unspecified lack of expected normal physiological development in childhood), R62.51 is specifically for failure to thrive (child). Related codes cover unspecified lack of expected normal physiological development in childhood (R62.50), short stature (child) (R62.52) and other lack of expected normal physiological development in childhood (R62.59).
Don't report R62.51 together with the conditions in its Excludes1 note: failure to thrive in child under 28 days old (P92.6).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific gain weight failure codes (official index)
Don't confuse with (Excludes1 for R62.51)
- failure to thrive in child under 28 days old (P92.6)
Common questions about gain weight failure ICD-10 codes
What is the ICD-10 code for gain weight failure?
- R62.51 — Failure to thrive (child). More specific codes apply when the documentation supports them: R62.7, P92.6.
What is the ICD-10 code for adult gain weight failure?
- R62.7 — Adult failure to thrive.
What is the ICD-10 code for newborn gain weight failure?
- P92.6 — Failure to thrive in newborn.
Is R62.51 billable?
- Yes. R62.51 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R62.51 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R62.51 as a principal diagnosis.
Is R62.51 a CC or MCC?
- No. R62.51 is neither a CC nor an MCC under MS-DRG v44.0.