Gevork Maissian, D.O.
NPI 1639320658 · Internal Medicine Physician · Glendale, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gevork Maissian, D.O. is a Internal Medicine Physician provider in Glendale, CA (NPI 1639320658).
Provider details
- NPI number
- 1639320658
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A10524 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 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
8,470 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 3,394 | $138 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,536 | $9 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 1,104 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 635 | $98 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 621 | $139 |
| Smoking and Tobacco Use Intensive Counseling, More Than 10 Minutes99407 | 333 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 290 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 2,081 | 226 |
| Amlodipine Besylate | 1,692 | 175 |
| Icosapent Ethylbrand: Vascepa | 1,557 | 188 |
| Rosuvastatin Calcium | 1,447 | 152 |
| Metformin Hcl | 1,387 | 147 |
| Diclofenac Sodium | 1,345 | 184 |
| Levothyroxine Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,110 across 134 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
- 2008-10-08
- Last updated
- 2011-10-03
Frequently asked questions
- What is Gevork Maissian's NPI number?
- Gevork Maissian's National Provider Identifier (NPI) is 1639320658, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gevork Maissian's specialty?
- Gevork Maissian is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gevork Maissian located?
- Gevork Maissian's practice location on file with NPPES is 1737 W Glenoaks Blvd, Glendale, CA 91201-1542.
- What is Gevork Maissian's phone number?
- The practice phone number listed in the NPPES registry for Gevork Maissian is (818) 243-1186.
- Does Gevork Maissian accept Medicare?
- Gevork Maissian is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gevork Maissian's NPI active?
- Yes — Gevork Maissian's NPI (1639320658) is active in the NPPES registry as of the last update on 2011-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.