Other Service Providers / 173F00000X
Individual · classification
173F00000X Sleep Specialist (PhD)
173F00000X is the taxonomy code for Sleep Specialist, PhD, in the NUCC group “Other Service Providers”. It is a code for individual providers — the kind used on a Type 1 NPI. It has no entry in the CMS Medicare taxonomy crosswalk.
- 1Taxonomy code 173F00000X
- 2Level Classification
- 3Medicare specialty Not in the crosswalk
- 4Codes in this group 38
Definition
Sleep medicine is a clinical specialty with a focus on clinical problems that require accurate diagnosis and treatment. The knowledge base of sleep medicine is derived from many disciplines including neuroanatomy, neurophysiology, respiratory physiology, pharmacology, psychology, psychiatry, neurology, general internal medicine, pulmonary medicine, and pediatrics as well as others.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 173F00000X sits
- Group: Other Service Providers — code 29 of 38 in the group
- Classification: Sleep Specialist, PhD 173F00000X
Sleep Specialist, PhD has no specializations, so 173F00000X is the only code for it. A provider may report more than one taxonomy code on an NPI but marks one as primary.
Medicare
173F00000X has no entry in the CMS Medicare Provider and Supplier Taxonomy Crosswalk. That usually means Medicare does not enroll this kind of provider under its own specialty — the provider can still hold an NPI and use this code on claims to other payers.
Related codes
No other codes share the classification Sleep Specialist, PhD. The rest of Other Service Providers is on the group page.
History of 173F00000X
173F00000X was added to the code set in 2008.
- 2008-01-01 — new
Similar codes in other groups
If 173F00000X is not quite right, these codes in other groups share a word with it — often the same field practised by a different kind of provider:
- 207QS1201X Sleep Medicine (Family Medicine) Physician (Allopathic & Osteopathic Physicians)
- 207RS0012X Sleep Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians)
- 207YS0012X Sleep Medicine (Otolaryngology) Physician (Allopathic & Osteopathic Physicians)
- 2080S0012X Pediatric Sleep Medicine Physician (Allopathic & Osteopathic Physicians)
- 2084S0012X Sleep Medicine (Psychiatry & Neurology) Physician (Allopathic & Osteopathic Physicians)
- 261QS1200X Sleep Disorder Diagnostic Clinic/Center (Ambulatory Health Care Facilities)
Find providers with 173F00000X
Using 173F00000X
The code goes in the taxonomy field of the NPI application in NPPES, and on claims where a payer asks for it — box 24J (shaded) or 33b on the CMS-1500 with the ZZ qualifier, or the PRV segment of an 837 electronic claim. Payers match it against the taxonomy on the NPI record and, for Medicare, against the specialty on the enrollment, so all three should agree. To see which code a provider uses, search their NPI in the lookup.
Sources: NUCC Health Care Provider Taxonomy code set, version 26.1 (CSV). Checked 2026-10-24. Methodology.