Dr. Thomas G. Ahn, MD
- Medicare services, 2024
- 9,328
- Medicare patients, 2024
- 437
- Part D claims, 2024
- 5,061
- MIPS score, 2024
- 75
- Hospital affiliations
- 1
- Practice address
- 2078 W Century Blvd, Los Angeles, CA 90047
- Practice phone
- Call (310) 277-7600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Thomas G Ahn M D a Prof Corp
Los Angeles, California
Find Dr. Ahn'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. Thomas G. Ahn is an internist in Los Angeles, California
Dr. Ahn practices at Thomas G Ahn M D a Prof Corp in Los Angeles, California.
Dr. Ahn's NPI, 1669556866, was assigned on October 24, 2006. Dr. Ahn graduated from VCU School of Medicine in 1979. Dr. Ahn holds California license G61939.
- NPI
- 1669556866NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1759560766
- NPI enumeration date
- October 24, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 277-7600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas G. Ahn practices at Thomas G Ahn M D a Prof Corp in Los Angeles, California
Dr. Ahn's primary practice is Thomas G Ahn M D a Prof Corp, at 2078 W Century Blvd, Los Angeles, CA 90047 in Los Angeles County. The practice phone is (310) 277-7600.
- Thomas G Ahn M D a Prof Corp2078 W Century Blvd, Los Angeles, CA 90047 · Los Angeles CountyPhone(310) 277-7600
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Thomas G. Ahn is affiliated with 4 sites of care
Dr. Ahn's primary practice is Thomas G Ahn M D a Prof Corp in Los Angeles, California. Dr. Ahn is also affiliated with Cedars-Sinai Medical Center. Dmand AI also links Dr. Ahn to 1 more physician office and 1 home health agency, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Thomas G. Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Thomas G Ahn M D a Prof Corp | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas G. Ahn is one of 16,751 internists in California
Internal medicine is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Ahn is board certified in endocrinology, diabetes and metabolism by the American Board of Internal Medicine. Dmand AI has Dr. Ahn's licenses on file in 4 states: California, Maryland, Illinois and Ohio.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Maryland license
- Illinois license
- Ohio license
Clinical focus
Dmand AI lists chronic diabetes, enlarged thyroid, fluid and electrolyte imbalances, high cholesterol, hypercalcemia, osteoporosis, overactive thyroid and parathyroid gland disorder among the conditions Dr. Ahn treats.
Internists near Dr. Ahn
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. Thomas G. Ahn billed Medicare for 9,328 services in 2024
CMS data shows 9,328 Medicare services from Dr. Ahn across 30 procedure codes in 2024, for 437 Medicare patients. Medicare paid $169,351 for them. Every service was in an office.
Dr. Ahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 7,4532024: 7,2792%
- Office and hospital visits
- 2023: 9282024: 9381%
- Surgery
- 2023: 6792024: 6731%
- Tests and treatments
- 2023: 3832024: 3742%
- Drugs given in the office
- 2023: 02024: 64
Dr. Ahn compared with the California median for internists, 2024
- Dr. Ahn
- California median
- Medicare services
- 9,328vs 36125.8 times
- Medicare patients
- 437vs 1512.9 times
- Part D claims
- 4,366vs 42110.4 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Ahn'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. Ahn?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ahn and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas G. Ahn treated 437 Medicare patients in 2024, average age 75
CMS counts 437 Medicare patients who saw Dr. Ahn in 2024. The largest group is 65 to 74, with 203 patients. 75% of them have high cholesterol, and 61% have high blood pressure. 7% are also on Medicaid. Their average risk score is 0.93, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ahn's median patient age at 65, with 55% women.
Dr. Ahn's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Ahn's Medicare patients by sex, 2024
- Women23955%
- Men19845%
Chronic conditions among Dr. Ahn's Medicare patients, 2024
- High cholesterol75%
- High blood pressure61%
- Arthritis51%
- Ischemic heart disease42%
- Diabetes26%
- Osteoporosis20%
- Cancer19%
- Mood disorders14%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahn'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
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas G. Ahn wrote 5,061 Medicare Part D claims in 2024
In 2024, Dr. Ahn wrote 5,061 Medicare Part D claims for 459 patients. 73% of them were for generic drugs. CMS names the drug for 4,366 of them, across 97 drugs with 11 or more claims each, at $801,155 in total drug cost. In 2023, CMS named 4,132 claims across 97 drugs.
Dr. Ahn's Part D claims by kind of drug, 2024
- Generic3,686 claims73%
- Brand-name1,270 claims25%
- Other105 claims2%
Dr. Ahn'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. Ahn's Part D claims, 2024
- Opioids1%27 of 5,061 claims
- Antibiotics3%127 of 5,061 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: 4,1322024: 4,3666%
Drugs named by CMS: 97 in 2024, 97 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. Thomas G. Ahn scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Ahn for performance year 2024, reported individually. Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
- MIPS final score, 2024
- 75 of 100
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. Thomas G. Ahn received $21,825 in industry payments from 2016 to 2025
CMS Open Payments shows 1,095 general payments to Dr. Ahn from 73 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $2,878.
General payments to Dr. Ahn by program year, 2016 to 2025
General payments to Dr. Ahn by kind, 2016 to 2025
- Food and beverage$21,70499%
- Education$620%
- Gifts$590%
Companies that paid Dr. Ahn 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. Thomas G. Ahn graduated from VCU School of Medicine
Dr. Ahn graduated from VCU School of Medicine in 1979.
- Medical school
- Board certified in endocrinology, diabetes and metabolism
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Thomas G. Ahn accepts plans from 8 insurance carriers
Dr. Ahn is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
Plan types Dr. Ahn accepts, by number of carriers
- Medicare7
- PPO6
- EPO3
- HMO3
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Thomas G. Ahn'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| 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. Thomas G. Ahn
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. Thomas G. Ahn's NPI number?
Dr. Thomas G. Ahn's NPI number is 1669556866. It was assigned on October 24, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas G. Ahn?
Dr. Thomas G. Ahn is an internist in Los Angeles, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Thomas G. Ahn practice?
Dr. Ahn practices at 2078 W Century Blvd, Los Angeles, CA 90047. Dr. Ahn's primary practice is Thomas G Ahn M D a Prof Corp in Los Angeles, California. Dmand AI also links Dr. Ahn to 1 physician office and 1 home health agency.
What is Dr. Thomas G. Ahn's office phone number?
The practice phone on file for Dr. Ahn is (310) 277-7600.
What is Dr. Thomas G. Ahn's medical license number?
Dr. Ahn holds California license G61939, one of the licenses on file in 4 states.
Which states has Dr. Thomas G. Ahn been licensed in?
Dmand AI has state licenses on file for Dr. Ahn in California (1987 to 2027), Maryland (1984 to 1988), Illinois (1982 to 1984) and Ohio (1981 to 1982).
Which hospitals is Dr. Thomas G. Ahn affiliated with?
Dr. Ahn is affiliated with Cedars-Sinai Medical Center.
Does Dr. Thomas G. Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 9,328 services in 2024, and Dr. Ahn accepts Medicare assignment.
What is Dr. Thomas G. Ahn's MIPS score?
Dr. Ahn's MIPS final score for performance year 2024 is 75 out of 100, reported individually.
How many Medicare patients does Dr. Thomas G. Ahn see?
CMS counts 437 Medicare patients who saw Dr. Ahn in 2024, with an average age of 75.
Show 7 more questionsShow fewer questions
Is Dr. Thomas G. Ahn board certified?
Yes. Dr. Ahn is board certified in endocrinology, diabetes and metabolism by the American Board of Internal Medicine.
What services does Dr. Thomas G. Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were surgery: heart and blood vessels (36415), lab and pathology test (84443) and lab and pathology test (80061).
Where did Dr. Thomas G. Ahn go to medical school?
Dr. Ahn graduated from VCU School of Medicine in 1979.
What drugs does Dr. Thomas G. Ahn prescribe most?
In 2024 Medicare Part D data, Dr. Ahn's most prescribed drugs by claims were Levothyroxine Sodium, Rosuvastatin Calcium and Atorvastatin Calcium.
Has Dr. Thomas G. Ahn received payments from drug or device companies?
CMS Open Payments shows $21,825 in general payments to Dr. Ahn from 73 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Thomas G. Ahn been practicing?
Dr. Ahn graduated from medical school in 1979, 47 years ago.
What insurance does Dr. Thomas G. Ahn accept?
Dr. Ahn is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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