Dr. Stephen Sun, DO

  • La Mesa, CA
  • Internist
NPI1437644242PAC ID4587063888
Medicare services, 2024
916
Medicare patients, 2024
260
Part D claims, 2024
334
Hospital affiliations
2
Industry payments
$593
Practice address
5555 Grossmont Center Drive Box 58, La Mesa, CA 91942
Practice phone
Call (619) 465-0711
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

Sharp Grossmont Hospital

Hospital · La Mesa, California

See all 4 affiliations

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Dr. Stephen Sun is an internist in La Mesa, California

Dr. Sun practices at Sharp Grossmont Hospital in La Mesa, California, part of Sharp HealthCare.

Dr. Sun's NPI, 1437644242, was assigned on June 25, 2018. Dr. Sun graduated from Arizona College of Osteopathic Medicine - Glendale in 2018. Dr. Sun's California license number on file is 20A18000.

NPI and contact details
Medicare PAC ID
4587063888
NPI enumeration date
June 25, 2018
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(619) 465-0711
Professional email
Get email
Personal email
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Mobile number
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Sex
Male
Estimated age
34
Medical school graduation
2018

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

Dr. Stephen Sun practices at Sharp Grossmont Hospital in La Mesa, California

Dr. Sun's primary practice is Sharp Grossmont Hospital, at 5555 Grossmont Center Drive Box 58, La Mesa, CA 91942 in San Diego County. The practice phone is (619) 465-0711.

  • Sharp Grossmont Hospital
    5555 Grossmont Center Drive Box 58, La Mesa, CA 91942 · San Diego CountyPhone(619) 465-0711

Source: Dmand AI Affiliation Data

Dr. Stephen Sun is affiliated with 2 sites of care and 2 medical groups

Dr. Sun's primary practice is Sharp Grossmont Hospital in La Mesa, California, part of Sharp HealthCare. Dr. Sun is also affiliated with Sharp Coronado Hospital. The medical group on file is Emergency and Acute Care Medical Corporation. Dmand AI also links Dr. Sun to 1 more medical group, named with a free account.

See all 4 affiliations for Dr. Sun

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

Dmand AI tracks the EHR system at Dr. Stephen Sun's practice

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

EHR by site
SiteEHR vendor and product
Sharp Grossmont HospitalAvailable 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. Stephen Sun is one of 16,751 internists in California

Internal medicine is Dr. Sun's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Sun is board certified in internal medicine by the American Board of Internal Medicine. Dr. Sun has a license on file in California.

Specialties and state licenses

  • Internal medicine, CaliforniaPrimaryLicense 20A18000 · 2020 to 2025 · taxonomy 207R00000X

Clinical focus

Dmand AI lists acute diabetes, acute respiratory failure, alcohol use disorders, anemia, cardiac arrhythmia, cellulitis, cirrhosis and congestive heart failure among the conditions Dr. Sun treats.

Internists near Dr. Sun

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. Stephen Sun billed Medicare for 916 services in 2024

CMS data shows 916 Medicare services from Dr. Sun across 5 procedure codes in 2024, for 260 Medicare patients. Medicare paid $87,433 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024916
Medicare patients260
Paid by Medicare$87,433
Procedure codes5

Dr. Sun's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 1,1022024: 91617%

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

  • Dr. Sun
  • California median
Medicare services
916vs 3612.5 times
Medicare patients
260vs 15172% above
Part D claims
161vs 42162% below

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

Dr. Sun'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. Sun

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

Dr. Stephen Sun treated 260 Medicare patients in 2024, average age 77

CMS counts 260 Medicare patients who saw Dr. Sun in 2024. The largest group is 75 to 84, with 86 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 40% are also on Medicaid. Their average risk score is 2.30, 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. Sun's median patient age at 65, with 56% women.

Medicare patients, 2024260
Average age77
Average risk score2.30
Also on Medicaid40%

Dr. Sun's Medicare patients by age, 2024

Dr. Sun's Medicare patients by sex, 2024

  • Women14154%
  • Men11946%

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

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis58%
  4. Ischemic heart disease46%
  5. Diabetes43%
  6. Heart failure43%
  7. Mood disorders43%
  8. Chronic kidney disease39%

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

Dr. Sun's patients across all payers

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

Patient panel by age, all payers

Median age 65

Patient panel by sex, all payers

  • Women56%
  • Men44%

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

Dr. Stephen Sun wrote 334 Medicare Part D claims in 2024

In 2024, Dr. Sun wrote 334 Medicare Part D claims for 164 patients. 90% of them were for generic drugs. CMS names the drug for 161 of them, across 10 drugs with 11 or more claims each, at $8,353 in total drug cost. In 2023, CMS named 129 claims across 8 drugs.

Part D claims, 2024334
Drugs named by CMS10
Total drug cost$8,353
Part D patients164

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

  • Generic302 claims90%
  • Brand-name and other32 claims10%

Dr. Sun'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. Sun's Part D claims, 2024

  • Opioids8%27 of 334 claims
  • Antibiotics27%89 of 334 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: 1292024: 16125%

Drugs named by CMS: 10 in 2024, 8 in 2023.

See all prescribing by Dr. Sun

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. Stephen Sun takes part in Medicare

Dr. Sun 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. Stephen Sun received $593 in industry payments from 2021 to 2025

CMS Open Payments shows 11 general payments to Dr. Sun from 10 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $123.

General payments to Dr. Sun by program year, 2021 to 2025

Companies that paid Dr. Sun the most, 2021 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Sun

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

Dr. Stephen Sun graduated from Arizona College of Osteopathic Medicine - Glendale

Dr. Sun graduated from Arizona College of Osteopathic Medicine - Glendale in 2018.

  1. Medical schoolArizona College of Osteopathic Medicine - Glendale
  2. Board certified in internal medicineAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. Stephen Sun accepts plans from 2 insurance carriers

Dr. Sun is in network with 2 carriers, including Elevance and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.

  • Elevance
  • CMS Medicare

Plan types Dr. Sun accepts, by number of carriers

  1. Medicare2
  2. PPO1

Source: Dmand AI Insurance Network Data

Sources for Dr. Stephen Sun'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)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
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. Stephen Sun

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. Stephen Sun's NPI number?

Dr. Stephen Sun's NPI number is 1437644242. It was assigned on June 25, 2018, and it is active in the NPI Registry.

What kind of doctor is Dr. Stephen Sun?

Dr. Stephen Sun is an internist in La Mesa, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).

Where does Dr. Stephen Sun practice?

Dr. Sun practices at 5555 Grossmont Center Drive Box 58, La Mesa, CA 91942. Dr. Sun's primary practice is Sharp Grossmont Hospital in La Mesa, California, part of Sharp HealthCare. Dmand AI also links Dr. Sun to 1 medical group.

What is Dr. Stephen Sun's office phone number?

The practice phone on file for Dr. Sun is (619) 465-0711.

What is Dr. Stephen Sun's medical license number?

Dr. Sun's California license number on file is 20A18000.

Which hospitals is Dr. Stephen Sun affiliated with?

Dr. Sun practices at Sharp Grossmont Hospital in La Mesa, California. Dr. Sun is also affiliated with Sharp Coronado Hospital.

What medical group is Dr. Stephen Sun part of?

Dr. Sun is linked to Emergency and Acute Care Medical Corporation. Dmand AI links Dr. Sun to 1 more medical group.

Does Dr. Stephen Sun accept Medicare?

Yes. CMS data shows Dr. Sun billed Medicare for 916 services in 2024, and Dr. Sun accepts Medicare assignment.

How many Medicare patients does Dr. Stephen Sun see?

CMS counts 260 Medicare patients who saw Dr. Sun in 2024, with an average age of 77.

Is Dr. Stephen Sun board certified?

Yes. Dr. Sun is board certified in internal medicine by the American Board of Internal Medicine.

Show 6 more questionsShow fewer questions

What services does Dr. Stephen Sun bill to Medicare?

In 2024, Dr. Sun's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99223).

Where did Dr. Stephen Sun go to medical school?

Dr. Sun graduated from Arizona College of Osteopathic Medicine - Glendale in 2018.

What drugs does Dr. Stephen Sun prescribe most?

In 2024 Medicare Part D data, Dr. Sun's most prescribed drugs by claims were Cefuroxime, Furosemide and Hydrocodone-Acetaminophen.

Has Dr. Stephen Sun received payments from drug or device companies?

CMS Open Payments shows $593 in general payments to Dr. Sun from 10 companies from 2021 to 2025. The largest total came from Abbvie Inc.

How long has Dr. Stephen Sun been practicing?

Dr. Sun graduated from medical school in 2018, 8 years ago.

What insurance does Dr. Stephen Sun accept?

Dr. Sun is in network with 2 carriers, including Elevance and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.

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