Dr. Mark L. Geller, MD
- Medicare services, 2024
- 1,818
- Medicare patients, 2024
- 314
- Part D claims, 2024
- 5,501
- Industry payments
- $6,125
- Affiliated sites
- 2
- Practice address
- 18133 Ventura Blvd. Ste 400, Tarzana, CA 91356
- Practice phone
- Call (714) 635-6272
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
United Pacific Surgery Center
Surgery Center - Medicare-Certified · Tarzana, California
Find Dr. Geller's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark L. Geller is an endocrinologist in Tarzana, California
Dr. Geller practices at United Pacific Surgery Center in Tarzana, California.
Dr. Geller's NPI, 1093710345, was assigned on June 14, 2005. Dr. Geller graduated from UC San Diego School of Medicine in 1985. Dr. Geller holds California license G60287.
- NPI
- 1093710345NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8921093279
- NPI enumeration date
- June 14, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (714) 635-6272
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark L. Geller practices at United Pacific Surgery Center in Tarzana, California
Dr. Geller's primary practice is United Pacific Surgery Center, at 18133 Ventura Blvd. Ste 400, Tarzana, CA 91356. The practice phone is (714) 635-6272.
- United Pacific Surgery Center18133 Ventura Blvd. Ste 400, Tarzana, CA 91356Phone(714) 635-6272
Source: Dmand AI Affiliation Data
Dr. Mark L. Geller is affiliated with 2 sites of care and 1 medical group
Dr. Geller's primary practice is United Pacific Surgery Center in Tarzana, California. The medical group on file is Facey Medical Group. Dmand AI also links Dr. Geller to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark L. Geller's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Geller practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| United Pacific Surgery Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark L. Geller is one of 1,062 endocrinologists in California
Endocrinology, diabetes and metabolism is Dr. Geller's primary specialty in the NPI Registry, under taxonomy code 207RE0101X. Dr. Geller is board certified in internal medicine by the American Board of Internal Medicine. Dr. Geller is licensed in California.
Specialties and state licenses
- Endocrinology, diabetes and metabolism, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute sinusitis, acute skin infection, aneurysm, ankle or foot injury, anxiety, asthma and atrial fibrillation and flutter among the conditions Dr. Geller treats.
Endocrinologists near Dr. Geller
Counts of endocrinologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark L. Geller billed Medicare for 1,818 services in 2024
CMS data shows 1,818 Medicare services from Dr. Geller across 14 procedure codes in 2024, for 314 Medicare patients. Medicare paid $97,752 for them. Every service was in an office.
Dr. Geller's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7302024: 7979%
- Surgery
- 2023: 5072024: 5498%
- Other services
- 2023: 752024: 334345%
- Tests and treatments
- 2023: 992024: 99No change
- Imaging
- 2023: 312024: 3926%
Dr. Geller compared with the California median for endocrinologists, 2024
- Dr. Geller
- California median
- Medicare services
- 1,818vs 6752.7 times
- Medicare patients
- 314vs 24031% above
- Part D claims
- 4,761vs 1,1044.3 times
Medians across 994 endocrinologists in California with Dmand AI profiles that report each measure.
Dr. Geller's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Geller?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Geller and other endocrinologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark L. Geller treated 314 Medicare patients in 2024, average age 75
CMS counts 314 Medicare patients who saw Dr. Geller in 2024. The largest group is 65 to 74, with 157 patients. 75% of them have high cholesterol, and 70% have high blood pressure. 10% are also on Medicaid. Their average risk score is 1.16, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Geller's median patient age at 63, with 50% women.
Dr. Geller's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Geller's Medicare patients by sex, 2024
- Women17455%
- Men14045%
Chronic conditions among Dr. Geller's Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis50%
- Diabetes34%
- Ischemic heart disease32%
- Anxiety23%
- Chronic kidney disease21%
- Mood disorders21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Geller's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark L. Geller wrote 5,501 Medicare Part D claims in 2024
In 2024, Dr. Geller wrote 5,501 Medicare Part D claims for 478 patients. 81% of them were for generic drugs. CMS names the drug for 4,761 of them, across 84 drugs with 11 or more claims each, at $665,562 in total drug cost. In 2023, CMS named 3,875 claims across 82 drugs.
Dr. Geller's Part D claims by kind of drug, 2024
- Generic4,450 claims81%
- Brand-name974 claims18%
- Other77 claims1%
Dr. Geller's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Geller's Part D claims, 2024
- Opioids1%34 of 5,501 claims
- Antibiotics2%116 of 5,501 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,8752024: 4,76123%
Drugs named by CMS: 84 in 2024, 82 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mark L. Geller offers telehealth to Medicare patients
Dr. Geller accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Geller as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Mark L. Geller received $6,125 in industry payments from 2016 to 2025
CMS Open Payments shows 355 general payments to Dr. Geller from 40 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Amgen Inc. paid the most, $899.
General payments to Dr. Geller by program year, 2016 to 2025
General payments to Dr. Geller by kind, 2016 to 2025
- Food and beverage$6,08099%
- Education$451%
Companies that paid Dr. Geller the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark L. Geller has 1 award and honors on record
Dmand AI lists 1 award for Dr. Geller, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Geller
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Mark L. Geller graduated from UC San Diego School of Medicine
Dr. Geller graduated from UC San Diego School of Medicine in 1985.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Mark L. Geller accepts plans from 12 insurance carriers
Dr. Geller is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- +4 more carriersWith a free account
Plan types Dr. Geller accepts, by number of carriers
- Medicare8
- PPO7
- HMO4
- POS4
- EPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark L. Geller's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark L. Geller
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark L. Geller's NPI number?
Dr. Mark L. Geller's NPI number is 1093710345. It was assigned on June 14, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark L. Geller?
Dr. Mark L. Geller is an endocrinologist in Tarzana, California. The primary specialty in the NPI Registry is Endocrinology, Diabetes & Metabolism Physician (taxonomy code 207RE0101X).
Where does Dr. Mark L. Geller practice?
Dr. Geller practices at 18133 Ventura Blvd. Ste 400, Tarzana, CA 91356. Dr. Geller's primary practice is United Pacific Surgery Center in Tarzana, California. Dmand AI also links Dr. Geller to 1 group practice or clinic.
What is Dr. Mark L. Geller's office phone number?
The practice phone on file for Dr. Geller is (714) 635-6272.
What is Dr. Mark L. Geller's medical license number?
Dr. Geller holds California license G60287.
What medical group is Dr. Mark L. Geller part of?
Dr. Geller is linked to Facey Medical Group.
Does Dr. Mark L. Geller accept Medicare?
Yes. CMS data shows Dr. Geller billed Medicare for 1,818 services in 2024, and Dr. Geller accepts Medicare assignment.
Does Dr. Mark L. Geller offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Geller as offering telehealth services.
How many Medicare patients does Dr. Mark L. Geller see?
CMS counts 314 Medicare patients who saw Dr. Geller in 2024, with an average age of 75.
Is Dr. Mark L. Geller board certified?
Yes. Dr. Geller is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Mark L. Geller bill to Medicare?
In 2024, Dr. Geller's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and medicare service (G2211).
Where did Dr. Mark L. Geller go to medical school?
Dr. Geller graduated from UC San Diego School of Medicine in 1985.
What drugs does Dr. Mark L. Geller prescribe most?
In 2024 Medicare Part D data, Dr. Geller's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Amlodipine Besylate.
Has Dr. Mark L. Geller received payments from drug or device companies?
CMS Open Payments shows $6,125 in general payments to Dr. Geller from 40 companies from 2016 to 2025. The largest total came from Amgen Inc.
How long has Dr. Mark L. Geller been practicing?
Dr. Geller graduated from medical school in 1985, 41 years ago.
What insurance does Dr. Mark L. Geller accept?
Dr. Geller is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
Selling to endocrinology, diabetes and metabolism practices?
See endocrinologists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card