Santo Diaz, M.D.
NPI 1821143108 · Critical Care Medicine (Internal Medicine) Physician · Greenfield, WI
Santo Diaz, M.D. is a Critical Care Medicine (Internal Medicine) Physician provider in Greenfield, WI (NPI 1821143108).
Provider details
- NPI number
- 1821143108
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 26774 (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
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
- 2007-01-24
- Last updated
- 2007-07-08
Frequently asked questions
- What is Santo Diaz's NPI number?
- Santo Diaz's National Provider Identifier (NPI) is 1821143108, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Santo Diaz's specialty?
- Santo Diaz is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Santo Diaz located?
- Santo Diaz's practice location on file with NPPES is 4925 S 43rd St, Greenfield, WI 53220-4809.
- What is Santo Diaz's phone number?
- The practice phone number listed in the NPPES registry for Santo Diaz is (414) 282-7137.
- Is Santo Diaz's NPI active?
- Yes — Santo Diaz's NPI (1821143108) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.