Alexander Klonoff, M.D.
NPI 1538629936 · Internal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Klonoff, M.D. is a Internal Medicine Physician provider in Los Angeles, CA (NPI 1538629936).
Provider details
- NPI number
- 1538629936
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 8700 Beverly Blvd Ste B220West Hollywood, CA 90048-1804Phone: (310) 423-5252Fax: (310) 423-8441
Registry dates
- Enumerated
- 2019-03-21
- Last updated
- 2025-04-09
- Certified
- 2025-04-09
Frequently asked questions
- What is Alexander Klonoff's NPI number?
- Alexander Klonoff's National Provider Identifier (NPI) is 1538629936, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Klonoff's specialty?
- Alexander Klonoff is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Klonoff located?
- Alexander Klonoff's practice location on file with NPPES is 1200 N State St, Los Angeles, CA 90089-1001.
- What is Alexander Klonoff's phone number?
- The practice phone number listed in the NPPES registry for Alexander Klonoff is (323) 409-7556.
- Does Alexander Klonoff accept Medicare?
- Alexander Klonoff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Klonoff's NPI active?
- Yes — Alexander Klonoff's NPI (1538629936) is active in the NPPES registry as of the last update on 2025-04-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.