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Mark Irwin, M.D.
NPI 1366433567 · Internal Medicine Physician · Belleville, IL
Mark Irwin, M.D. is a Internal Medicine Physician provider in Belleville, IL (NPI 1366433567).
Provider details
- NPI number
- 1366433567
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 336-023425 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
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
2900 Frank Scott Pkwy W
Suite 904
Belleville, IL 62223-5000
Phone: (618) 234-0640
Fax: (314) 851-4475
Street-level locationGet directions
Mailing address
Po Box 23340
Saint Louis, MO 63156-3340
Registry dates
- Enumerated
- 2005-11-04
- Last updated
- 2012-09-21
Frequently asked questions
- What is Mark Irwin's NPI number?
- Mark Irwin's National Provider Identifier (NPI) is 1366433567, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Irwin's specialty?
- Mark Irwin is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Irwin located?
- Mark Irwin's practice location on file with NPPES is 2900 Frank Scott Pkwy W, Belleville, IL 62223-5000.
- What is Mark Irwin's phone number?
- The practice phone number listed in the NPPES registry for Mark Irwin is (618) 234-0640.
- Is Mark Irwin's NPI active?
- Yes — Mark Irwin's NPI (1366433567) is active in the NPPES registry as of the last update on 2012-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.