Alfonso Martinez, MD
NPI 1841243581 · Pediatric Gastroenterology Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alfonso Martinez, MD is a Pediatric Gastroenterology Physician provider in Milwaukee, WI (NPI 1841243581).
Provider details
- NPI number
- 1841243581
- Entity type
- Individual
- Primary specialty
- Pediatric Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 37826 (WI)
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
- 2006-05-17
- Last updated
- 2014-05-05
Frequently asked questions
- What is Alfonso Martinez's NPI number?
- Alfonso Martinez's National Provider Identifier (NPI) is 1841243581, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alfonso Martinez's specialty?
- Alfonso Martinez is listed in the NPPES registry with a primary specialty of Pediatric Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Alfonso Martinez located?
- Alfonso Martinez's practice location on file with NPPES is 9000 W Wisconsin Ave, Milwaukee, WI 53226-4874.
- What is Alfonso Martinez's phone number?
- The practice phone number listed in the NPPES registry for Alfonso Martinez is (414) 266-3690.
- Does Alfonso Martinez accept Medicare?
- Alfonso Martinez is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alfonso Martinez's NPI active?
- Yes — Alfonso Martinez's NPI (1841243581) is active in the NPPES registry as of the last update on 2014-05-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.