Dr. Thomas S. Lam, MD
- Medicare services, 2024
- 345
- Medicare patients, 2024
- 182
- Part D claims, 2024
- 562
- Publications
- 1
- Industry payments
- $2,794
- Practice address
- 500 N Garfield Ave, Monterey Park, CA 91754
- Practice phone
- Call (626) 280-3003
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Global Gastroenterology Group Inc
Monterey Park, California
Find Dr. Lam'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 S. Lam is a gastroenterologist in Monterey Park, California
Dr. Lam practices at Global Gastroenterology Group Inc in Monterey Park, California.
Dr. Lam's NPI, 1437185295, was assigned on June 24, 2006. Dr. Lam graduated from American University of the Caribbean School of Medicine in 1981. Dr. Lam's California license number on file is A44280.
- NPI
- 1437185295NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4284621731
- NPI enumeration date
- June 24, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (626) 280-3003
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 71
- Medical school graduation
- 1981
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas S. Lam practices at Global Gastroenterology Group Inc in Monterey Park, California
Dr. Lam's primary practice is Global Gastroenterology Group Inc, at 500 N Garfield Ave, Monterey Park, CA 91754 in Los Angeles County. The practice phone is (626) 280-3003.
- Global Gastroenterology Group Inc500 N Garfield Ave, Monterey Park, CA 91754 · Los Angeles CountyPhone(626) 280-3003
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Thomas S. Lam is affiliated with 2 sites of care and 2 medical groups
Dr. Lam's primary practice is Global Gastroenterology Group Inc in Monterey Park, California. The medical group on file is AMG Medical Group. Dmand AI also links Dr. Lam to 1 more group practice or clinic and 1 medical group, 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 S. Lam's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lam practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Global Gastroenterology Group Inc | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas S. Lam is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Lam's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Lam is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Lam's licenses on file in 3 states: California, New York and Pennsylvania.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
- New York license
- Pennsylvania license
Clinical focus
Dmand AI lists acid reflux, acute gastroduodenitis, chronic indigestion, colonoscopy, gastroduodenitis, hemorrhoids and upper GI endoscopy among the conditions Dr. Lam treats.
Gastroenterologists near Dr. Lam
Counts of gastroenterologists 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 S. Lam billed Medicare for 345 services in 2024
CMS data shows 345 Medicare services from Dr. Lam across 5 procedure codes in 2024, for 182 Medicare patients. Medicare paid $36,577 for them.
Dr. Lam's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1552024: 26873%
- Surgery
- 2023: 782024: 771%
Where Dr. Lam's Medicare services took place, 2024
- In an office30488%
- In a facility4112%
Dr. Lam compared with the California median for gastroenterologists, 2024
- Dr. Lam
- California median
- Medicare services
- 345vs 58641% below
- Medicare patients
- 182vs 30240% below
- Part D claims
- 485vs 38028% above
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Lam'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. Lam?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lam and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas S. Lam treated 182 Medicare patients in 2024, average age 72
CMS counts 182 Medicare patients who saw Dr. Lam in 2024. The largest group is 65 to 74, with 109 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 80% are also on Medicaid. Their average risk score is 1.18, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Lam's median patient age at 61, with 56% women.
Dr. Lam's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Lam's Medicare patients by sex, 2024
- Women10859%
- Men7441%
Chronic conditions among Dr. Lam's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes54%
- Chronic kidney disease47%
- Osteoporosis41%
- Arthritis37%
- Ischemic heart disease27%
- COPD23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lam's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas S. Lam wrote 562 Medicare Part D claims in 2024
In 2024, Dr. Lam wrote 562 Medicare Part D claims for 367 patients. 97% of them were for generic drugs. CMS names the drug for 485 of them, across 9 drugs with 11 or more claims each, at $11,922 in total drug cost. In 2023, CMS named 290 claims across 7 drugs.
Dr. Lam's Part D claims by kind of drug, 2024
- Generic546 claims97%
- Brand-name16 claims3%
Dr. Lam'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: 2902024: 48567%
Drugs named by CMS: 9 in 2024, 7 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 S. Lam ranks in the 43rd percentile for colonoscopy in Medicare
Dr. Lam accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Lam as offering telehealth. CMS counts 13 procedures of colonoscopy by Dr. Lam, more than 43% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Lam ranks in Medicare procedure volume
- Colonoscopy
- 43rd percentile13 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Thomas S. Lam has 1 publication on record
Dmand AI links 1 paper to Dr. Lam.
Recent publications by Dr. Lam
See who Dr. Lam researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lam works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Thomas S. Lam received $2,794 in industry payments from 2016 to 2025
CMS Open Payments shows 86 general payments to Dr. Lam from 14 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Abbvie Inc. paid the most, $1,182.
General payments to Dr. Lam by program year, 2016 to 2025
General payments to Dr. Lam by kind, 2016 to 2025
- Food and beverage$2,74398%
- Consulting fees$401%
- Education$100%
Companies that paid Dr. Lam 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 S. Lam graduated from American University of the Caribbean School of Medicine
Dr. Lam graduated from American University of the Caribbean School of Medicine in 1981.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Thomas S. Lam accepts plans from 10 insurance carriers
Dr. Lam is in network with 10 carriers, including Blue Cross Blue Shield of Michigan, Aetna and LA Care. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Aetna
- LA Care
- Blue Cross Blue Shield of Massachusetts
- Elevance
- HCSC
- Molina
- Regence Health Plans
- +2 more carriersWith a free account
Plan types Dr. Lam accepts, by number of carriers
- Medicare9
- HMO5
- PPO5
- POS2
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Thomas S. Lam'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)Doctors and Clinicians Utilization Data (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. Thomas S. Lam
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 S. Lam's NPI number?
Dr. Thomas S. Lam's NPI number is 1437185295. It was assigned on June 24, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas S. Lam?
Dr. Thomas S. Lam is a gastroenterologist in Monterey Park, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Thomas S. Lam practice?
Dr. Lam practices at 500 N Garfield Ave, Monterey Park, CA 91754. Dr. Lam's primary practice is Global Gastroenterology Group Inc in Monterey Park, California. Dmand AI also links Dr. Lam to 1 group practice or clinic and 1 medical group.
What is Dr. Thomas S. Lam's office phone number?
The practice phone on file for Dr. Lam is (626) 280-3003.
What is Dr. Thomas S. Lam's medical license number?
Dr. Lam's California license number on file is A44280, one of the licenses on file in 3 states.
Which states has Dr. Thomas S. Lam been licensed in?
Dmand AI has state licenses on file for Dr. Lam in California (1987 to 2025), New York (since 1988) and Pennsylvania (1987 to 1988).
What medical group is Dr. Thomas S. Lam part of?
Dr. Lam is linked to AMG Medical Group. Dmand AI links Dr. Lam to 1 more medical group.
Does Dr. Thomas S. Lam accept Medicare?
Yes. CMS data shows Dr. Lam billed Medicare for 345 services in 2024, and Dr. Lam accepts Medicare assignment.
Does Dr. Thomas S. Lam offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Lam as offering telehealth services.
How many Medicare patients does Dr. Thomas S. Lam see?
CMS counts 182 Medicare patients who saw Dr. Lam in 2024, with an average age of 72.
Show 8 more questionsShow fewer questions
Is Dr. Thomas S. Lam board certified?
Yes. Dr. Lam is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Thomas S. Lam bill to Medicare?
In 2024, Dr. Lam's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99203) and surgery: digestive system (43239).
Where did Dr. Thomas S. Lam go to medical school?
Dr. Lam graduated from American University of the Caribbean School of Medicine in 1981.
What drugs does Dr. Thomas S. Lam prescribe most?
In 2024 Medicare Part D data, Dr. Lam's most prescribed drugs by claims were Gavilyte-G, Omeprazole and Gavilyte-C.
Has Dr. Thomas S. Lam received payments from drug or device companies?
CMS Open Payments shows $2,794 in general payments to Dr. Lam from 14 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Thomas S. Lam been practicing?
Dr. Lam graduated from medical school in 1981, 45 years ago.
Does Dr. Thomas S. Lam do research?
Dmand AI links 1 publication to Dr. Lam.
What insurance does Dr. Thomas S. Lam accept?
Dr. Lam is in network with 10 carriers, including Blue Cross Blue Shield of Michigan, Aetna and LA Care. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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