William Underwood, MD
NPI 1639120082 · Anesthesiology Physician · Crystal City, MO
William Underwood, MD is a Anesthesiology Physician provider in Crystal City, MO (NPI 1639120082).
Provider details
- NPI number
- 1639120082
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2003024400 (MO)
Specialties & taxonomies
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
1 documented practice location
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
Registry dates
- Enumerated
- 2006-05-12
- Last updated
- 2023-03-07
Frequently asked questions
- What is William Underwood's NPI number?
- William Underwood's National Provider Identifier (NPI) is 1639120082, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Underwood's specialty?
- William Underwood is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Underwood located?
- William Underwood's practice location on file with NPPES is Hwy 61s at Hwy 67, Crystal City, MO 63019.
- What is William Underwood's phone number?
- The practice phone number listed in the NPPES registry for William Underwood is (636) 933-1000.
- Is William Underwood's NPI active?
- Yes — William Underwood's NPI (1639120082) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.