John Gruen, MD
NPI 1619036365 · Internal Medicine Physician · Panorama City, CA
John Gruen, MD is a Internal Medicine Physician provider in Panorama City, CA (NPI 1619036365).
Provider details
- NPI number
- 1619036365
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A44209 (CA)
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Potassium Chloride | 32 | 18 |
| Furosemide | 31 | 16 |
| Triamcinolone Acetonide | 19 | 13 |
| Sucralfate | 18 | 17 |
| Finasteride | 14 | — |
| Lisinopril | 14 | — |
| Famotidine | 13 | 12 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-08
- Last updated
- 2021-11-30
Frequently asked questions
- What is John Gruen's NPI number?
- John Gruen's National Provider Identifier (NPI) is 1619036365, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gruen's specialty?
- John Gruen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Gruen located?
- John Gruen's practice location on file with NPPES is 13652 Cantara St, Panorama City, CA 91402-5423.
- What is John Gruen's phone number?
- The practice phone number listed in the NPPES registry for John Gruen is (818) 375-2000.
- Is John Gruen's NPI active?
- Yes — John Gruen's NPI (1619036365) is active in the NPPES registry as of the last update on 2021-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.