Mark Underwood, MD
NPI 1265414460 · Neonatal-Perinatal Medicine Physician · Spokane, WA
Mark Underwood, MD is a Neonatal-Perinatal Medicine Physician provider in Spokane, WA (NPI 1265414460).
Provider details
- NPI number
- 1265414460
- Entity type
- Individual
- Primary specialty
- Neonatal-Perinatal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD61106174 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 2315 Stockton BlvdNicuSacramento, CA 95817-2201Phone: (916) 703-3050Fax: (916) 703-3055
Registry dates
- Enumerated
- 2005-11-15
- Last updated
- 2021-02-05
- Certified
- 2021-02-05
Frequently asked questions
- What is Mark Underwood's NPI number?
- Mark Underwood's National Provider Identifier (NPI) is 1265414460, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Underwood's specialty?
- Mark Underwood is listed in the NPPES registry with a primary specialty of Neonatal-Perinatal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Underwood located?
- Mark Underwood's practice location on file with NPPES is 101 W 8th Ave, Spokane, WA 99204-2307.
- What is Mark Underwood's phone number?
- The practice phone number listed in the NPPES registry for Mark Underwood is (509) 474-3131.
- Is Mark Underwood's NPI active?
- Yes — Mark Underwood's NPI (1265414460) is active in the NPPES registry as of the last update on 2021-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.