Dr. Tatiana Tam, DO
- Medicare services, 2024
- 108
- Medicare patients, 2024
- 39
- Part D claims, 2024
- 428
- Hospital affiliations
- 1
- Medical group
- 1
- Practice address
- 975 Sereno Dr, Vallejo, CA 94589
- Practice phone
- Call (707) 651-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Tam's professional email, personal email and mobile number
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Dr. Tatiana Tam is an internist in Vallejo, California
Dr. Tam practices at Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente.
Dr. Tam's NPI, 1790304988, was assigned on April 8, 2020. Dr. Tam graduated from Touro University California in 2020. Dr. Tam holds California license 20A21019.
- NPI
- 1790304988NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9436504784
- NPI enumeration date
- April 8, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 651-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Tatiana Tam practices at Vallejo Medical Center in Vallejo, California
Dr. Tam's primary practice is Vallejo Medical Center, at 975 Sereno Dr, Vallejo, CA 94589 in Solano County. The practice phone is (707) 651-1000.
- Vallejo Medical Center975 Sereno Dr, Vallejo, CA 94589 · Solano CountyPhone(707) 651-1000
Source: Dmand AI Affiliation Data
Dr. Tatiana Tam is affiliated with 3 sites of care and 1 medical group
Dr. Tam's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Tam to 1 more home health agency and 1 hospice, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Tatiana Tam's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tam practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Vallejo Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Tatiana Tam is one of 16,751 internists in California
Internal medicine is Dr. Tam's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Tam is board certified in internal medicine by the American Board of Internal Medicine. Dr. Tam is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Tam
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. Tatiana Tam billed Medicare for 108 services in 2024
CMS data shows 108 Medicare services from Dr. Tam across 2 procedure codes in 2024, for 39 Medicare patients. Medicare paid $7,061 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Tam compared with the California median for internists, 2024
- Dr. Tam
- California median
- Medicare services
- 108vs 36170% below
- Medicare patients
- 39vs 15174% below
- Part D claims
- 185vs 42156% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Tam'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Tatiana Tam treated 39 Medicare patients in 2024, average age 67
CMS counts 39 Medicare patients who saw Dr. Tam in 2024. The largest group is under 65, with 16 patients. 75% of them have high blood pressure, and 69% have high cholesterol. 62% are also on Medicaid. Their average risk score is 3.47, 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. Tam's median patient age at 70, with 49% women.
Dr. Tam's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Tam's Medicare patients by sex, 2024
- Women1333%
- Men2667%
Chronic conditions among Dr. Tam's Medicare patients, 2024
- High blood pressure75%
- High cholesterol69%
- Heart failure67%
- Chronic kidney disease56%
- Diabetes51%
- Ischemic heart disease38%
- Arthritis36%
- Anxiety31%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tam's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women49%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Tatiana Tam wrote 428 Medicare Part D claims in 2024
In 2024, Dr. Tam wrote 428 Medicare Part D claims for 151 patients. 91% of them were for generic drugs. CMS names the drug for 185 of them, across 10 drugs with 11 or more claims each, at $1,880 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Dr. Tam's Part D claims by kind of drug, 2024
- Generic388 claims91%
- Brand-name and other40 claims9%
Dr. Tam'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. Tam's Part D claims, 2024
- Opioids3%11 of 428 claims
- Antibiotics23%97 of 428 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: 122024: 1851442%
Drugs named by CMS: 10 in 2024, 1 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
How Dr. Tatiana Tam takes part in Medicare
Dr. Tam 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. Tatiana Tam graduated from Touro University California
Dr. Tam graduated from Touro University California in 2020.
- Medical school
- Board certified in internal medicine
- Board certified in 2023 - 2027
Source: Dmand AI Professional Profile Data
Dr. Tatiana Tam accepts plans from 2 insurance carriers
Dr. Tam 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. Tam accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Tatiana Tam'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) |
| 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. Tatiana Tam
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. Tatiana Tam's NPI number?
Dr. Tatiana Tam's NPI number is 1790304988. It was assigned on April 8, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Tatiana Tam?
Dr. Tatiana Tam is an internist in Vallejo, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Tatiana Tam practice?
Dr. Tam practices at 975 Sereno Dr, Vallejo, CA 94589. Dr. Tam's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. Dmand AI also links Dr. Tam to 1 home health agency and 1 hospice.
What is Dr. Tatiana Tam's office phone number?
The practice phone on file for Dr. Tam is (707) 651-1000.
What is Dr. Tatiana Tam's medical license number?
Dr. Tam holds California license 20A21019.
Which hospitals is Dr. Tatiana Tam affiliated with?
Dr. Tam practices at Vallejo Medical Center in Vallejo, California.
What medical group is Dr. Tatiana Tam part of?
Dr. Tam is linked to The Permanente Medical Group, Inc.
Does Dr. Tatiana Tam accept Medicare?
Yes. CMS data shows Dr. Tam billed Medicare for 108 services in 2024, and Dr. Tam accepts Medicare assignment.
How many Medicare patients does Dr. Tatiana Tam see?
CMS counts 39 Medicare patients who saw Dr. Tam in 2024, with an average age of 67.
Is Dr. Tatiana Tam board certified?
Yes. Dr. Tam is board certified in internal medicine by the American Board of Internal Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. Tatiana Tam bill to Medicare?
In 2024, Dr. Tam's most billed Medicare services were hospital inpatient care (99232) and hospital inpatient care (99238).
Where did Dr. Tatiana Tam go to medical school?
Dr. Tam graduated from Touro University California in 2020.
What drugs does Dr. Tatiana Tam prescribe most?
In 2024 Medicare Part D data, Dr. Tam's most prescribed drugs by claims were Furosemide, Atorvastatin Calcium and Doxycycline Monohydrate.
How long has Dr. Tatiana Tam been practicing?
Dr. Tam graduated from medical school in 2020, 6 years ago.
What insurance does Dr. Tatiana Tam accept?
Dr. Tam 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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