James Massimilian, D.O.
NPI 1598766966 · Emergency Medicine Physician · Palos Heights, IL
James Massimilian, D.O. is a Emergency Medicine Physician provider in Palos Heights, IL (NPI 1598766966).
Provider details
- NPI number
- 1598766966
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 036079253 (IL)
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
- 2005-08-09
- Last updated
- 2007-11-16
Frequently asked questions
- What is James Massimilian's NPI number?
- James Massimilian's National Provider Identifier (NPI) is 1598766966, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Massimilian's specialty?
- James Massimilian is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Massimilian located?
- James Massimilian's practice location on file with NPPES is 12251 S 80th Ave, Palos Heights, IL 60463-1256.
- What is James Massimilian's phone number?
- The practice phone number listed in the NPPES registry for James Massimilian is (708) 923-5800.
- Is James Massimilian's NPI active?
- Yes — James Massimilian's NPI (1598766966) is active in the NPPES registry as of the last update on 2007-11-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.