Mark Geller, M.D.
NPI 1093710345 · Endocrinology, Diabetes & Metabolism Physician · Tarzana, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Geller, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Tarzana, CA (NPI 1093710345).
Provider details
- NPI number
- 1093710345
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G60287 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
21 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,775 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 594 | $138 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 549 | $9 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 241 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 86 | $99 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 57 | $98 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 84 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 500 | 137 |
| Levothyroxine Sodium | 356 | 86 |
| Amlodipine Besylate | 294 | 80 |
| Losartan Potassium | 228 | 60 |
| Metformin Hcl | 203 | 55 |
| Rosuvastatin Calcium | 177 | 51 |
| Lisinopril |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-14
- Last updated
- 2018-10-23
Frequently asked questions
- What is Mark Geller's NPI number?
- Mark Geller's National Provider Identifier (NPI) is 1093710345, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Geller's specialty?
- Mark Geller is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Geller located?
- Mark Geller's practice location on file with NPPES is 18133 Ventura Blvd, Tarzana, CA 91356-3641.
- What is Mark Geller's phone number?
- The practice phone number listed in the NPPES registry for Mark Geller is (818) 466-7700.
- Does Mark Geller accept Medicare?
- Mark Geller is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Geller's NPI active?
- Yes — Mark Geller's NPI (1093710345) is active in the NPPES registry as of the last update on 2018-10-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.