IndividualActive
John Greist, M.D.
NPI 1598961005 · Psychiatry Physician · Madison, WI
John Greist, M.D. is a Psychiatry Physician provider in Madison, WI (NPI 1598961005).
Provider details
- NPI number
- 1598961005
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 15607 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(89/100 index)
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
Healthcare Technology Systems, Inc.
7617 Mineral Point Rd., Ste. 300
Madison, WI 53717
Phone: (608) 827-2450
Fax: (608) 827-2444
Approximate (ZIP-level) locationGet directions
Mailing address
Healthcare Technology Systems, Inc.
Madison, WI 53717
Registry dates
- Enumerated
- 2007-06-22
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Greist's NPI number?
- John Greist's National Provider Identifier (NPI) is 1598961005, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Greist's specialty?
- John Greist is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Greist located?
- John Greist's practice location on file with NPPES is Healthcare Technology Systems, Inc., Madison, WI 53717.
- What is John Greist's phone number?
- The practice phone number listed in the NPPES registry for John Greist is (608) 827-2450.
- Is John Greist's NPI active?
- Yes — John Greist's NPI (1598961005) 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.