Dr. John W. Zamarra, MD
- Medicare services, 2024
- 574
- Medicare patients, 2024
- 486
- Part D claims, 2024
- 1,000
- Publications
- 1
- MIPS score, 2024
- 85
- Practice address
- 41820 Garstin Drive, Big Bear Lake, CA 92315
- Practice phone
- Call (909) 878-8246
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
BVCHD Family Health Center - Big Bear Lake
Rural Health Clinic - Hospital-Owned · Big Bear Lake, California
Find Dr. Zamarra'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. John W. Zamarra is a cardiologist in Big Bear Lake, California
Dr. Zamarra practices at BVCHD Family Health Center - Big Bear Lake in Big Bear Lake, California.
Dr. Zamarra's NPI, 1518052489, was assigned on October 4, 2006. Dr. Zamarra graduated from Jacobs School of Medicine and Biomedical Sciences in 1972. Dr. Zamarra holds California license G37204.
- NPI
- 1518052489NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7517972870
- NPI enumeration date
- October 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 878-8246
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 77
- Medical school graduation
- 1972
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John W. Zamarra practices at BVCHD Family Health Center - Big Bear Lake in Big Bear Lake, California
Dr. Zamarra's primary practice is BVCHD Family Health Center - Big Bear Lake, at 41820 Garstin Drive, Big Bear Lake, CA 92315. The practice phone is (909) 878-8246.
- BVCHD Family Health Center - Big Bear Lake41820 Garstin Drive, Big Bear Lake, CA 92315Phone(909) 878-8246
Source: Dmand AI Affiliation Data
Dr. John W. Zamarra is affiliated with 5 sites of care and 2 medical groups
Dr. Zamarra's primary practice is BVCHD Family Health Center - Big Bear Lake in Big Bear Lake, California. Dr. Zamarra is also affiliated with Bear Valley Community Hospital. The medical group on file is Bear Valley Community Hospital. Dmand AI also links Dr. Zamarra to 1 more hospital, 2 physician offices and 1 medical group, each named with a free account. Dr. Zamarra's employer is on file too: a rural health clinic (rhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John W. Zamarra's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zamarra practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| BVCHD Family Health Center - Big Bear Lake | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John W. Zamarra is one of 2,375 cardiologists in California
Cardiovascular disease is Dr. Zamarra's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Zamarra is board certified in cardiovascular disease by the American Board of Internal Medicine. Dmand AI has Dr. Zamarra's licenses on file in 3 states: California, New York and Montana.
Specialties and state licenses
- Cardiovascular disease, CaliforniaPrimary
- New York license
- Montana license
Clinical focus
Dmand AI lists acute mini-stroke (TIA), alcohol use disorders, aneurysm, anxiety, aortic atherosclerois, arterial blot clot /embolism, asthma and atrial fibrillation and flutter among the conditions Dr. Zamarra treats.
Cardiologists near Dr. Zamarra
Counts of cardiologists 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. John W. Zamarra billed Medicare for 574 services in 2024
CMS data shows 574 Medicare services from Dr. Zamarra across 6 procedure codes in 2024, for 486 Medicare patients. Medicare paid $6,397 for them.
Dr. Zamarra's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,5052024: 46282%
- Office and hospital visits
- 2023: 1,4252024: 11292%
Where Dr. Zamarra's Medicare services took place, 2024
- In an office193%
- In a facility55597%
Dr. Zamarra compared with the California median for cardiologists, 2024
- Dr. Zamarra
- California median
- Medicare services
- 574vs 1,56063% below
- Medicare patients
- 486vs 64425% below
- Part D claims
- 770vs 1,41045% below
Medians across 2,237 cardiologists in California with Dmand AI profiles that report each measure.
Dr. Zamarra'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. Zamarra?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zamarra and other cardiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John W. Zamarra treated 486 Medicare patients in 2024, average age 77
CMS counts 486 Medicare patients who saw Dr. Zamarra in 2024. The largest group is 75 to 84, with 181 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 31% are also on Medicaid. Their average risk score is 1.83, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Zamarra's median patient age at 63, with 53% women.
Dr. Zamarra's Medicare patients by age, 2024
Dr. Zamarra's Medicare patients by sex, 2024
- Women28158%
- Men20542%
Chronic conditions among Dr. Zamarra's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Diabetes40%
- Atrial fibrillation38%
- Heart failure37%
- Ischemic heart disease36%
- Chronic kidney disease33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zamarra'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
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John W. Zamarra wrote 1,000 Medicare Part D claims in 2024
In 2024, Dr. Zamarra wrote 1,000 Medicare Part D claims for 260 patients. 73% of them were for generic drugs. CMS names the drug for 770 of them, across 27 drugs with 11 or more claims each, at $278,611 in total drug cost. In 2023, CMS named 2,076 claims across 36 drugs.
Dr. Zamarra's Part D claims by kind of drug, 2024
- Generic730 claims73%
- Brand-name270 claims27%
Dr. Zamarra'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. Zamarra's Part D claims, 2024
- Antibiotics1%14 of 1,000 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: 2,0762024: 77063%
Drugs named by CMS: 27 in 2024, 36 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. John W. Zamarra scored 85 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 85 out of 100 for Dr. Zamarra for performance year 2024, reported as part of a group. Dr. Zamarra accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Zamarra's MIPS scores, performance year 2024
- 85of 100Final score
- 81.7of 100Quality
- 97of 100Promoting Interoperability
- 40of 100Improvement Activities
- 67of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John W. Zamarra has 1 publication on record
Dmand AI links 1 paper to Dr. Zamarra.
Recent publications by Dr. Zamarra
See who Dr. Zamarra researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Zamarra works with, so you can find a warm path to the right cardiologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John W. Zamarra received $2,950 in industry payments from 2016 to 2025
CMS Open Payments shows 93 general payments to Dr. Zamarra from 23 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Novartis Pharmaceuticals Corporation paid the most, $506.
General payments to Dr. Zamarra by program year, 2016 to 2025
General payments to Dr. Zamarra by kind, 2016 to 2025
- Food and beverage$2,92899%
- Education$231%
Companies that paid Dr. Zamarra 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. John W. Zamarra graduated from Jacobs School of Medicine and Biomedical Sciences
Dr. Zamarra graduated from Jacobs School of Medicine and Biomedical Sciences in 1972.
- Medical school
- Board certified in cardiovascular disease
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. John W. Zamarra accepts plans from 5 insurance carriers
Dr. Zamarra is in network with 5 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. Zamarra accepts, by number of carriers
- Medicare5
- PPO4
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. John W. Zamarra'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. John W. Zamarra
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. John W. Zamarra's NPI number?
Dr. John W. Zamarra's NPI number is 1518052489. It was assigned on October 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John W. Zamarra?
Dr. John W. Zamarra is a cardiologist in Big Bear Lake, California. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. John W. Zamarra practice?
Dr. Zamarra practices at 41820 Garstin Drive, Big Bear Lake, CA 92315. Dr. Zamarra's primary practice is BVCHD Family Health Center - Big Bear Lake in Big Bear Lake, California. Dmand AI also links Dr. Zamarra to 1 hospital, 2 physician offices and 1 medical group.
What is Dr. John W. Zamarra's office phone number?
The practice phone on file for Dr. Zamarra is (909) 878-8246.
What is Dr. John W. Zamarra's medical license number?
Dr. Zamarra holds California license G37204, one of the licenses on file in 3 states.
Which states has Dr. John W. Zamarra been licensed in?
Dmand AI has state licenses on file for Dr. Zamarra in California (1978 to 2027), New York (2020 to 2022) and Montana (2019 to 2021).
Which hospitals is Dr. John W. Zamarra affiliated with?
Dr. Zamarra is affiliated with Bear Valley Community Hospital. Dmand AI links Dr. Zamarra to 1 more hospital.
What medical group is Dr. John W. Zamarra part of?
Dr. Zamarra is linked to Bear Valley Community Hospital. Dmand AI links Dr. Zamarra to 1 more medical group.
Does Dr. John W. Zamarra accept Medicare?
Yes. CMS data shows Dr. Zamarra billed Medicare for 574 services in 2024, and Dr. Zamarra accepts Medicare assignment.
What is Dr. John W. Zamarra's MIPS score?
Dr. Zamarra's MIPS final score for performance year 2024 is 85 out of 100, reported as part of a group.
Show 9 more questionsShow fewer questions
How many Medicare patients does Dr. John W. Zamarra see?
CMS counts 486 Medicare patients who saw Dr. Zamarra in 2024, with an average age of 77.
Is Dr. John W. Zamarra board certified?
Yes. Dr. Zamarra is board certified in cardiovascular disease by the American Board of Internal Medicine.
What services does Dr. John W. Zamarra bill to Medicare?
In 2024, Dr. Zamarra's most billed Medicare services were heart test or procedure (93010), office visit, established patient (99213) and heart test or procedure (93306).
Where did Dr. John W. Zamarra go to medical school?
Dr. Zamarra graduated from Jacobs School of Medicine and Biomedical Sciences in 1972.
What drugs does Dr. John W. Zamarra prescribe most?
In 2024 Medicare Part D data, Dr. Zamarra's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Atorvastatin Calcium.
Has Dr. John W. Zamarra received payments from drug or device companies?
CMS Open Payments shows $2,950 in general payments to Dr. Zamarra from 23 companies from 2016 to 2025. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. John W. Zamarra been practicing?
Dr. Zamarra graduated from medical school in 1972, 54 years ago.
Does Dr. John W. Zamarra do research?
Dmand AI links 1 publication to Dr. Zamarra.
What insurance does Dr. John W. Zamarra accept?
Dr. Zamarra is in network with 5 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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