Gregor Paronian, M.D.
NPI 1366627945 · Internal Medicine Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregor Paronian, M.D. is a Internal Medicine Physician provider in Pasadena, CA (NPI 1366627945).
Provider details
- NPI number
- 1366627945
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A107875 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
10,695 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, Each Additional 20 Minutes99458 | 2,606 | $43 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,458 | $139 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, First 20 Minutes99457 | 1,450 | $54 |
| Remote Monitoring of Physiologic Parameters, Initial Supply of Devices With Daily Recordings Or Programmed Alerts Transmission, Each 30 Days99454 | 1,306 | $56 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,063 | $9 |
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 313 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 2,263 | 392 |
| Atorvastatin Calcium | 1,415 | 254 |
| Levothyroxine Sodium | 1,162 | 181 |
| Amlodipine Besylate | 1,084 | 195 |
| Metformin Hcl | 994 | 152 |
| Gabapentin | 975 | 155 |
| Escitalopram Oxalate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,204 across 143 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-01-02
- Last updated
- 2020-07-31
- Certified
- 2020-07-31
Frequently asked questions
- What is Gregor Paronian's NPI number?
- Gregor Paronian's National Provider Identifier (NPI) is 1366627945, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregor Paronian's specialty?
- Gregor Paronian is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregor Paronian located?
- Gregor Paronian's practice location on file with NPPES is 1713 E Walnut St, Pasadena, CA 91106-1611.
- What is Gregor Paronian's phone number?
- The practice phone number listed in the NPPES registry for Gregor Paronian is (626) 696-3607.
- Does Gregor Paronian accept Medicare?
- Gregor Paronian is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregor Paronian's NPI active?
- Yes — Gregor Paronian's NPI (1366627945) is active in the NPPES registry as of the last update on 2020-07-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.