John Duncan, M.D.
NPI 1003903543 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Houston, TX
John Duncan, M.D. is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Houston, TX (NPI 1003903543).
Provider details
- NPI number
- 1003903543
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- D8200 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
19 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
- 2006-10-06
- Last updated
- 2016-12-09
Frequently asked questions
- What is John Duncan's NPI number?
- John Duncan's National Provider Identifier (NPI) is 1003903543, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Duncan's specialty?
- John Duncan is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is John Duncan located?
- John Duncan's practice location on file with NPPES is 1101 Bates Ave, Houston, TX 77030-2607.
- What is John Duncan's phone number?
- The practice phone number listed in the NPPES registry for John Duncan is (832) 355-4900.
- Is John Duncan's NPI active?
- Yes — John Duncan's NPI (1003903543) is active in the NPPES registry as of the last update on 2016-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.