Dr. Winona M. Tan, MD
- Medicare services, 2024
- 30
- Medicare patients, 2024
- 45
- Part D claims, 2024
- 79
- Hospital affiliations
- 2
- Medical group
- 1
- Practice address
- 725 Welch Road, Palo Alto, CA 94304
- Practice phone
- Call (650) 497-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Tan'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. Winona M. Tan is an OB-GYN in Palo Alto, California
Dr. Tan practices at Lucile Packard Children's Hospital Stanford in Palo Alto, California, part of Stanford University.
Dr. Tan's NPI, 1003904350, was assigned on October 11, 2006. Dr. Tan graduated from UCSF School of Medicine in 1993. Dr. Tan holds California license G80084.
- NPI
- 1003904350NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385703305
- NPI enumeration date
- October 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (650) 497-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Winona M. Tan practices at Lucile Packard Children's Hospital Stanford in Palo Alto, California
Dr. Tan's primary practice is Lucile Packard Children's Hospital Stanford, at 725 Welch Road, Palo Alto, CA 94304 in Santa Clara County. The practice phone is (650) 497-8000.
- Lucile Packard Children's Hospital Stanford725 Welch Road, Palo Alto, CA 94304 · Santa Clara CountyPhone(650) 497-8000
Source: Dmand AI Affiliation Data
Dr. Winona M. Tan is affiliated with 3 sites of care and 1 medical group
Dr. Tan's primary practice is Lucile Packard Children's Hospital Stanford in Palo Alto, California, part of Stanford University. Dr. Tan is also affiliated with Mills-Peninsula Medical Center. The medical group on file is Palo Alto Foundation Medical Group. Dmand AI also links Dr. Tan to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Winona M. Tan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lucile Packard Children's Hospital Stanford | 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. Winona M. Tan is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Tan's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Tan is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dmand AI has Dr. Tan's licenses on file in 2 states: California and Hawaii.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
- Hawaii license
Clinical focus
Dmand AI lists menopause and vaginal infection among the conditions Dr. Tan treats.
OB-GYNs near Dr. Tan
Counts of OB-GYNs 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. Winona M. Tan billed Medicare for 30 services in 2024
CMS data shows 30 Medicare services from Dr. Tan across 2 procedure codes in 2024, for 45 Medicare patients. Medicare paid $1,809 for them. Every service was in an office.
Dr. Tan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 122024: 1742%
- Office and hospital visits
- 2023: 122024: 138%
Dr. Tan compared with the California median for OB-GYNs, 2024
- Dr. Tan
- California median
- Medicare services
- 30vs 5848% below
- Medicare patients
- 45vs 5213% below
- Part D claims
- 21vs 3540% below
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Tan'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tan and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Winona M. Tan treated 45 Medicare patients in 2024, average age 75
CMS counts 45 Medicare patients who saw Dr. Tan in 2024. The largest group is 65 to 74, with 22 patients. 75% of them have high cholesterol, and 49% have high blood pressure. Their average risk score is 0.82, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tan's median patient age at 38, with 99% women.
Dr. Tan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Tan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure49%
- Osteoporosis44%
- Arthritis38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women99%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Winona M. Tan wrote 79 Medicare Part D claims in 2024
In 2024, Dr. Tan wrote 79 Medicare Part D claims for 30 patients. 73% of them were for generic drugs. CMS names the drug for 21 of them, across 1 drug with 11 or more claims each, at $1,026 in total drug cost. In 2023, CMS named 20 claims across 1 drug.
Dr. Tan's Part D claims by kind of drug, 2024
- Generic58 claims73%
- Brand-name21 claims27%
Dr. Tan'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: 202024: 215%
Drugs named by CMS: 1 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
Dr. Winona M. Tan offers telehealth to Medicare patients
Dr. Tan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Tan as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Winona M. Tan has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Tan, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Tan
- 2013
- CMS Stage 1 EHR
- Undated
- ACOG Fellow
Source: Dmand AI Professional Profile Data
Dr. Winona M. Tan graduated from UCSF School of Medicine
Dr. Tan graduated from UCSF School of Medicine in 1993. Dr. Tan is a member of American College of Obstetricians and Gynecologists.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. Winona M. Tan accepts plans from 3 insurance carriers
Dr. Tan is in network with 3 carriers, including Aetna, Blue Cross Blue Shield of Michigan and CMS Medicare. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- CMS Medicare
Plan types Dr. Tan accepts, by number of carriers
- HMO2
- Medicare2
- POS2
- PPO2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Winona M. Tan'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) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Winona M. Tan
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. Winona M. Tan's NPI number?
Dr. Winona M. Tan's NPI number is 1003904350. It was assigned on October 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Winona M. Tan?
Dr. Winona M. Tan is an OB-GYN in Palo Alto, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Winona M. Tan practice?
Dr. Tan practices at 725 Welch Road, Palo Alto, CA 94304. Dr. Tan's primary practice is Lucile Packard Children's Hospital Stanford in Palo Alto, California, part of Stanford University. Dmand AI also links Dr. Tan to 1 group practice or clinic.
What is Dr. Winona M. Tan's office phone number?
The practice phone on file for Dr. Tan is (650) 497-8000.
What is Dr. Winona M. Tan's medical license number?
Dr. Tan holds California license G80084, one of the licenses on file in 2 states.
Which states has Dr. Winona M. Tan been licensed in?
Dmand AI has state licenses on file for Dr. Tan in California (1994 to 2026) and Hawaii (1996 to 1998).
Which hospitals is Dr. Winona M. Tan affiliated with?
Dr. Tan practices at Lucile Packard Children's Hospital Stanford in Palo Alto, California. Dr. Tan is also affiliated with Mills-Peninsula Medical Center.
What medical group is Dr. Winona M. Tan part of?
Dr. Tan is linked to Palo Alto Foundation Medical Group.
Does Dr. Winona M. Tan accept Medicare?
Yes. CMS data shows Dr. Tan billed Medicare for 30 services in 2024, and Dr. Tan accepts Medicare assignment.
Does Dr. Winona M. Tan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Tan as offering telehealth services.
Show 7 more questionsShow fewer questions
How many Medicare patients does Dr. Winona M. Tan see?
CMS counts 45 Medicare patients who saw Dr. Tan in 2024, with an average age of 75.
Is Dr. Winona M. Tan board certified?
Yes. Dr. Tan is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
What services does Dr. Winona M. Tan bill to Medicare?
In 2024, Dr. Tan's most billed Medicare services were medicare service (G0101) and office visit, established patient (99213).
Where did Dr. Winona M. Tan go to medical school?
Dr. Tan graduated from UCSF School of Medicine in 1993.
What drugs does Dr. Winona M. Tan prescribe most?
In 2024 Medicare Part D data, Dr. Tan's most prescribed drugs by claims were Estradiol.
How long has Dr. Winona M. Tan been practicing?
Dr. Tan graduated from medical school in 1993, 33 years ago.
What insurance does Dr. Winona M. Tan accept?
Dr. Tan is in network with 3 carriers, including Aetna, Blue Cross Blue Shield of Michigan and CMS Medicare. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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