Dr. Jason Joseph Gajarsa, MD

  • Harbor City, CA
  • Internist
NPI1427256577PAC ID2163568783
Medicare services, 2024
15
Medicare patients, 2024
50
Part D claims, 2024
3,267
Publications
2
Hospital affiliations
1
Practice address
25825 South Vermont Avenue, Harbor City, CA 90710
Practice phone
Call (310) 325-5111
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Kaiser Permanente South Bay Medical Center

Hospital · Harbor City, California

See all 4 affiliations

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Dr. Jason Joseph Gajarsa is an internist in Harbor City, California

Dr. Gajarsa practices at Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente.

Dr. Gajarsa's NPI, 1427256577, was assigned on July 10, 2007. Dr. Gajarsa graduated from Georgetown University School Of Medicine in 2004. Dr. Gajarsa holds California license A99066.

NPI and contact details
Medicare PAC ID
2163568783
NPI enumeration date
July 10, 2007
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(310) 325-5111
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Male
Estimated age
48
Medical school graduation
2004

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Jason Joseph Gajarsa practices at Kaiser Permanente South Bay Medical Center in Harbor City, California

Dr. Gajarsa's primary practice is Kaiser Permanente South Bay Medical Center, at 25825 South Vermont Avenue, Harbor City, CA 90710 in Los Angeles County. The practice phone is (310) 325-5111.

Source: Dmand AI Affiliation Data

Dr. Jason Joseph Gajarsa is affiliated with 2 sites of care and 2 medical groups

Dr. Gajarsa's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Gajarsa to 1 more group practice or clinic and 1 medical group, each named with a free account.

See all 4 affiliations for Dr. Gajarsa

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Jason Joseph Gajarsa's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gajarsa practices, 2 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Kaiser Permanente South Bay Medical CenterAvailable with a free account
+1 more site and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Jason Joseph Gajarsa is one of 16,751 internists in California

Internal medicine is Dr. Gajarsa's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gajarsa is board certified in cardiovascular disease by the American Board of Internal Medicine. Dmand AI has Dr. Gajarsa's licenses on file in 3 states: California, District of Columbia and Virginia.

Specialties and state licenses

  • Internal medicine, CaliforniaPrimaryLicense A99066 · 2007 to 2027 · taxonomy 207R00000X
  • District of Columbia license2004 to 2008
  • Virginia license2004 to 2008

Clinical focus

Dmand AI lists atrial fibrillation and flutter and chronic hypertension among the conditions Dr. Gajarsa treats.

Internists near Dr. Gajarsa

Counts of internists 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. Jason Joseph Gajarsa billed Medicare for 15 services in 2024

CMS data shows 15 Medicare services from Dr. Gajarsa across 1 procedure code in 2024, for 50 Medicare patients. Medicare paid $31 for them. Every service was in an office.

Medicare services, 202415
Medicare patients50
Paid by Medicare$31
Procedure codes1

Dr. Gajarsa's Medicare services by type, 2022 to 2024

  • 2022
  • 2024
Drugs given in the office
2022: 02024: 15
Tests and treatments
2022: 122024: 0100%

Dr. Gajarsa compared with the California median for internists, 2024

  • Dr. Gajarsa
  • California median
Medicare services
15vs 36196% below
Medicare patients
50vs 15167% below
Part D claims
3,074vs 4217.3 times

Medians across 15,815 internists in California with Dmand AI profiles that report each measure.

Dr. Gajarsa'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.

See all procedures by Dr. Gajarsa

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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gajarsa and other internists in California.

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Jason Joseph Gajarsa treated 50 Medicare patients in 2024, average age 69

CMS counts 50 Medicare patients who saw Dr. Gajarsa in 2024. The largest group is under 65, with 16 patients. 70% of them have high blood pressure, and 58% have high cholesterol. 40% are also on Medicaid. Their average risk score is 2.04, 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. Gajarsa's median patient age at 62, with 60% women.

Medicare patients, 202450
Average age69
Average risk score2.04
Also on Medicaid40%

Dr. Gajarsa's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Gajarsa's Medicare patients by sex, 2024

  • Women2244%
  • Men2856%

Chronic conditions among Dr. Gajarsa's Medicare patients, 2024

  1. High blood pressure70%
  2. High cholesterol58%
  3. Diabetes50%
  4. Chronic kidney disease44%
  5. Cancer34%
  6. Heart failure32%
  7. Atrial fibrillation28%
  8. Arthritis26%

Share of Medicare patients with each condition. A patient can have several.

Dr. Gajarsa's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 62

Patient panel by sex, all payers

  • Women60%
  • Men40%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Jason Joseph Gajarsa wrote 3,267 Medicare Part D claims in 2024

In 2024, Dr. Gajarsa wrote 3,267 Medicare Part D claims for 591 patients. 78% of them were for generic drugs. CMS names the drug for 3,074 of them, across 44 drugs with 11 or more claims each, at $1,484,775 in total drug cost. In 2023, CMS named 2,862 claims across 40 drugs.

Part D claims, 20243,267
Drugs named by CMS44
Total drug cost$1.5M
Part D patients591

Dr. Gajarsa's Part D claims by kind of drug, 2024

  • Generic2,532 claims78%
  • Brand-name and other735 claims22%

Dr. Gajarsa'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.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 2,8622024: 3,0747%

Drugs named by CMS: 44 in 2024, 40 in 2023.

See all prescribing by Dr. Gajarsa

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

How Dr. Jason Joseph Gajarsa takes part in Medicare

Dr. Gajarsa accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Accepts Medicare assignment
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Dr. Jason Joseph Gajarsa has 2 publications on record

Dmand AI links 2 papers to Dr. Gajarsa.

Papers2

Recent publications by Dr. Gajarsa

See all 2 publications and co-authors

See who Dr. Gajarsa researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gajarsa works with, so you can find a warm path to the right internists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Jason Joseph Gajarsa received $15 in industry payments in 2021

CMS Open Payments shows 1 general payment to Dr. Gajarsa from 1 drug or device company in 2021. Food and beverage make up the largest share, 100% of the total. Astellas Pharma US Inc paid the most, $15.

Companies that paid Dr. Gajarsa the most, 2021 to 2021

Share is of all general payments to this clinician.

See all payments to Dr. Gajarsa

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Jason Joseph Gajarsa has 1 award and honors on record

Dmand AI lists 1 award for Dr. Gajarsa.

Awards and honors for Dr. Gajarsa

  1. Undated
    • ACC Fellow

Source: Dmand AI Professional Profile Data

Dr. Jason Joseph Gajarsa graduated from Georgetown University School Of Medicine

Dr. Gajarsa graduated from Georgetown University School Of Medicine in 2004. Dr. Gajarsa is a member of ACC.

  1. Medical schoolGeorgetown University School Of Medicine
  2. Board certified in cardiovascular diseaseAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. Jason Joseph Gajarsa accepts plans from 2 insurance carriers

Dr. Gajarsa is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.

  • Kaiser Permanente
  • CMS Medicare

Plan types Dr. Gajarsa accepts, by number of carriers

  1. EPO1
  2. HMO1
  3. Medicare1
  4. POS1

Source: Dmand AI Insurance Network Data

Sources for Dr. Jason Joseph Gajarsa's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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 percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Jason Joseph Gajarsa

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. Jason Joseph Gajarsa's NPI number?

Dr. Jason Joseph Gajarsa's NPI number is 1427256577. It was assigned on July 10, 2007, and it is active in the NPI Registry.

What kind of doctor is Dr. Jason Joseph Gajarsa?

Dr. Jason Joseph Gajarsa is an internist in Harbor City, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).

Where does Dr. Jason Joseph Gajarsa practice?

Dr. Gajarsa practices at 25825 South Vermont Avenue, Harbor City, CA 90710. Dr. Gajarsa's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente. Dmand AI also links Dr. Gajarsa to 1 group practice or clinic and 1 medical group.

What is Dr. Jason Joseph Gajarsa's office phone number?

The practice phone on file for Dr. Gajarsa is (310) 325-5111.

What is Dr. Jason Joseph Gajarsa's medical license number?

Dr. Gajarsa holds California license A99066, one of the licenses on file in 3 states.

Which states has Dr. Jason Joseph Gajarsa been licensed in?

Dmand AI has state licenses on file for Dr. Gajarsa in California (2007 to 2027), District of Columbia (2004 to 2008) and Virginia (2004 to 2008).

Which hospitals is Dr. Jason Joseph Gajarsa affiliated with?

Dr. Gajarsa practices at Kaiser Permanente South Bay Medical Center in Harbor City, California.

What medical group is Dr. Jason Joseph Gajarsa part of?

Dr. Gajarsa is linked to Southern California Permanente Medical Group. Dmand AI links Dr. Gajarsa to 1 more medical group.

Does Dr. Jason Joseph Gajarsa accept Medicare?

Yes. CMS data shows Dr. Gajarsa billed Medicare for 15 services in 2024, and Dr. Gajarsa accepts Medicare assignment.

How many Medicare patients does Dr. Jason Joseph Gajarsa see?

CMS counts 50 Medicare patients who saw Dr. Gajarsa in 2024, with an average age of 69.

Show 8 more questionsShow fewer questions

Is Dr. Jason Joseph Gajarsa board certified?

Yes. Dr. Gajarsa is board certified in cardiovascular disease by the American Board of Internal Medicine.

What services does Dr. Jason Joseph Gajarsa bill to Medicare?

In 2024, Dr. Gajarsa's most billed Medicare services were injected or infused drug (J7030).

Where did Dr. Jason Joseph Gajarsa go to medical school?

Dr. Gajarsa graduated from Georgetown University School Of Medicine in 2004.

What drugs does Dr. Jason Joseph Gajarsa prescribe most?

In 2024 Medicare Part D data, Dr. Gajarsa's most prescribed drugs by claims were Metoprolol Tartrate, Pradaxa and Losartan Potassium.

Has Dr. Jason Joseph Gajarsa received payments from drug or device companies?

CMS Open Payments shows $15 in general payments to Dr. Gajarsa from 1 company from 2021 to 2021. The largest total came from Astellas Pharma US Inc.

How long has Dr. Jason Joseph Gajarsa been practicing?

Dr. Gajarsa graduated from medical school in 2004, 22 years ago.

Does Dr. Jason Joseph Gajarsa do research?

Dmand AI links 2 publications to Dr. Gajarsa.

What insurance does Dr. Jason Joseph Gajarsa accept?

Dr. Gajarsa is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.

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