IndividualActive
Donald Horowitz, MD
NPI 1982734356 · Psychiatry Physician · Claremont, CA
Donald Horowitz, MD is a Psychiatry Physician provider in Claremont, CA (NPI 1982734356).
Provider details
- NPI number
- 1982734356
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A22814 (CA)
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
480 N Indian Hill Blvd
Ste. A-1
Claremont, CA 91711-4615
Phone: (909) 625-5509
Fax: (909) 625-5508
Street-level locationGet directions
Mailing address
Po Box 1990
Claremont, CA 91711-8990
Registry dates
- Enumerated
- 2007-03-06
- Last updated
- 2014-03-26
Frequently asked questions
- What is Donald Horowitz's NPI number?
- Donald Horowitz's National Provider Identifier (NPI) is 1982734356, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Donald Horowitz's specialty?
- Donald Horowitz is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Donald Horowitz located?
- Donald Horowitz's practice location on file with NPPES is 480 N Indian Hill Blvd, Claremont, CA 91711-4615.
- What is Donald Horowitz's phone number?
- The practice phone number listed in the NPPES registry for Donald Horowitz is (909) 625-5509.
- Is Donald Horowitz's NPI active?
- Yes — Donald Horowitz's NPI (1982734356) is active in the NPPES registry as of the last update on 2014-03-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.