npidata.org Sign in
Products
Provider RadarWatch an area and specialty — weekly alerts on new cliniciansPractice RadarWeekly alerts when new organisations register nearbySpecialtiesEvery NUCC taxonomy, with counts by state and cityStatesProvider counts and breakdowns for all 50 statesPhysician listsMDs and DOs with addresses and phone numbersNP listsNurse practitioners, the fastest-growing groupAPIJSON, delta feed, free tier
Use cases
Healthcare sales prospectingPhysician recruiting and locum staffingMedical device sales territory planningCredentialing and provider verificationHealthcare marketing lists and audience buildingPharmaceutical sales and prescriber targeting
Account
Start freeThree radars and an export a month Sign in Pricing
Explore
Data Labs API
About
About usTermsPrivacyContact us

Search › Illinois › Internal Medicine Physician

Guillermo Reyes Martinez, MD

NPI 1033912787 · on the registry since 2025

Practice

Address
3134 N Clark St
Chicago, IL 60657
Phone
(312) 766-4949
Organisation at this address
Advocate Health And Hospitals Corporation
Inferred from a shared address, not stated in the registry.
Clinicians at this address
183

Registry record

Primary taxonomy
Internal Medicine Physician
207R00000X
Also registered as
Student in an Organized Health Care Education/Training Program
Licence states on file
IL
From the registry's licence fields, which are often incomplete.
Sex
Male
Record last updated
2025-06-28

Source: CMS National Plan and Provider Enumeration System. Registration is not the same as practising, and the registry records no retirement — some people listed here no longer practise. More in Illinois