ICD-10-CM 2027
ICD-10 code for Napping excess
From the official ICD-10-CM alphabetic index entry “Excess, excessive, excessively › napping”. Page updated September 29, 2026.
About coding Napping excess
The ICD-10-CM code for Napping excess is Z72.821 (Inadequate sleep hygiene).
Within Z72.82 (problems related to sleep), Z72.821 is specifically for inadequate sleep hygiene. Related codes cover sleep deprivation (Z72.820) and risk of suffocation (smothering) under another while sleeping (Z72.823).
Don't report Z72.821 together with the conditions in its Excludes1 note: insomnia (F51.0-, G47.0-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for Z72.821)
Common questions about Napping excess ICD-10 codes
What is the ICD-10 code for Napping excess?
- Z72.821 — Inadequate sleep hygiene.
Is Z72.821 billable?
- Yes. Z72.821 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z72.821 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z72.821 a CC or MCC?
- No. Z72.821 is neither a CC nor an MCC under MS-DRG v44.0.