Dr. Fadi Samir Tahhan, DO
- Medicare services, 2024
- 16
- Medicare patients, 2024
- 27
- Part D claims, 2024
- 960
- Hospital affiliations
- 3
- Industry payments
- $739
- Practice address
- 401 W Poplar St, Walla Walla, WA 99362
- Practice phone
- Call (509) 522-5900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Tahhan'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. Fadi Samir Tahhan is an internist in Apple Valley, California
Dr. Tahhan practices at Providence St. Mary Medical Center in Walla Walla, Washington, part of Providence Health & Services.
Dr. Tahhan's NPI, 1477177798, was assigned on June 2, 2020. Dr. Tahhan graduated from Liberty University College of Osteopathic Medicine in 2020. Dr. Tahhan holds California license 20A20519.
- NPI
- 1477177798NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0244674828
- NPI enumeration date
- June 2, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (509) 522-5900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- 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. Fadi Samir Tahhan practices in Walla Walla and Apple Valley
Dr. Tahhan's primary practice is Providence St. Mary Medical Center, at 401 W Poplar St, Walla Walla, WA 99362 in Walla Walla County. The practice phone is (509) 522-5900. Dr. Tahhan also practices at Providence St Mary Medical Center, 18300 Hwy 18, Apple Valley, CA 92307.
- Providence St. Mary Medical CenterPrimary401 W Poplar St, Walla Walla, WA 99362 · Walla Walla CountyPhone(509) 522-5900
- Providence St Mary Medical Center18300 Hwy 18, Apple Valley, CA 92307 · San Bernardino CountyPhone(760) 242-2311
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Fadi Samir Tahhan is affiliated with 5 sites of care and 1 medical group
Dr. Tahhan's primary practice is Providence St. Mary Medical Center in Walla Walla, Washington, part of Providence Health & Services. Dr. Tahhan is also affiliated with Providence St. Mary Medical Center. The medical group on file is Heritage Victor Valley Medical Group. Dmand AI also links Dr. Tahhan to 1 more hospital, 1 physician office and 1 group practice or clinic, 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. Fadi Samir Tahhan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tahhan practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence St. Mary Medical Center | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Fadi Samir Tahhan is one of 16,751 internists in California
Internal medicine is Dr. Tahhan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Tahhan is board certified in internal medicine by the American Board of Internal Medicine. Dr. Tahhan is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Tahhan
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. Fadi Samir Tahhan billed Medicare for 16 services in 2024
CMS data shows 16 Medicare services from Dr. Tahhan across 1 procedure code in 2024, all of them office visits, for 27 Medicare patients. Medicare paid $1,672 for them. Every service was in an office.
Dr. Tahhan compared with the California median for internists, 2024
- Dr. Tahhan
- California median
- Medicare services
- 16vs 36196% below
- Medicare patients
- 27vs 15182% below
- Part D claims
- 627vs 42149% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Tahhan'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. Tahhan and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Fadi Samir Tahhan treated 27 Medicare patients in 2024, average age 73
CMS counts 27 Medicare patients who saw Dr. Tahhan in 2024. The largest group is 65 to 74, with 16 patients. 75% of them have high cholesterol, and 70% have high blood pressure. Their average risk score is 1.30, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tahhan's median patient age at 71, with 52% women.
Dr. Tahhan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Tahhan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis44%
- Diabetes44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tahhan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women52%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Fadi Samir Tahhan wrote 960 Medicare Part D claims in 2024
In 2024, Dr. Tahhan wrote 960 Medicare Part D claims for 351 patients. 86% of them were for generic drugs. CMS names the drug for 627 of them, across 23 drugs with 11 or more claims each, at $15,408 in total drug cost. In 2023, CMS named 135 claims across 8 drugs.
Dr. Tahhan's Part D claims by kind of drug, 2024
- Generic828 claims86%
- Brand-name119 claims12%
- Other13 claims1%
Dr. Tahhan'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. Tahhan's Part D claims, 2024
- Opioids1%14 of 960 claims
- Antibiotics24%228 of 960 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: 1352024: 627364%
Drugs named by CMS: 23 in 2024, 8 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. Fadi Samir Tahhan takes part in Medicare
Dr. Tahhan 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. Fadi Samir Tahhan received $739 in industry payments from 2022 to 2025
CMS Open Payments shows 8 general payments to Dr. Tahhan from 4 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Jazz Pharmaceuticals Inc. paid the most, $524.
General payments to Dr. Tahhan by program year, 2022 to 2025
Companies that paid Dr. Tahhan the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Fadi Samir Tahhan graduated from Liberty University College of Osteopathic Medicine
Dr. Tahhan graduated from Liberty University College of Osteopathic Medicine in 2020.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Fadi Samir Tahhan accepts plans from 2 insurance carriers
Dr. Tahhan is in network with 2 carriers, including Molina and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Molina
- CMS Medicare
Plan types Dr. Tahhan accepts, by number of carriers
- Medicare2
- HMO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Fadi Samir Tahhan'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 Affiliation DataDmand AI Practice 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) |
| 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. Fadi Samir Tahhan
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. Fadi Samir Tahhan's NPI number?
Dr. Fadi Samir Tahhan's NPI number is 1477177798. It was assigned on June 2, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Fadi Samir Tahhan?
Dr. Fadi Samir Tahhan is an internist in Apple Valley, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Fadi Samir Tahhan practice?
Dr. Tahhan practices at 401 W Poplar St, Walla Walla, WA 99362. Dr. Tahhan also practices at 18300 Hwy 18, Apple Valley, CA 92307. Dr. Tahhan's primary practice is Providence St. Mary Medical Center in Walla Walla, Washington, part of Providence Health & Services. Dmand AI also links Dr. Tahhan to 1 hospital, 1 physician office and 1 group practice or clinic.
What is Dr. Fadi Samir Tahhan's office phone number?
The practice phone on file for Dr. Tahhan is (509) 522-5900.
What is Dr. Fadi Samir Tahhan's medical license number?
Dr. Tahhan holds California license 20A20519.
Which hospitals is Dr. Fadi Samir Tahhan affiliated with?
Dr. Tahhan practices at Providence St. Mary Medical Center in Walla Walla, Washington. Dr. Tahhan is also affiliated with Providence St. Mary Medical Center. Dmand AI links Dr. Tahhan to 1 more hospital.
What medical group is Dr. Fadi Samir Tahhan part of?
Dr. Tahhan is linked to Heritage Victor Valley Medical Group.
Does Dr. Fadi Samir Tahhan accept Medicare?
Yes. CMS data shows Dr. Tahhan billed Medicare for 16 services in 2024, and Dr. Tahhan accepts Medicare assignment.
How many Medicare patients does Dr. Fadi Samir Tahhan see?
CMS counts 27 Medicare patients who saw Dr. Tahhan in 2024, with an average age of 73.
Is Dr. Fadi Samir Tahhan board certified?
Yes. Dr. Tahhan is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Fadi Samir Tahhan bill to Medicare?
In 2024, Dr. Tahhan's most billed Medicare services were office visit, established patient (99214).
Where did Dr. Fadi Samir Tahhan go to medical school?
Dr. Tahhan graduated from Liberty University College of Osteopathic Medicine in 2020.
What drugs does Dr. Fadi Samir Tahhan prescribe most?
In 2024 Medicare Part D data, Dr. Tahhan's most prescribed drugs by claims were Atorvastatin Calcium, Furosemide and Pantoprazole Sodium.
Has Dr. Fadi Samir Tahhan received payments from drug or device companies?
CMS Open Payments shows $739 in general payments to Dr. Tahhan from 4 companies from 2022 to 2025. The largest total came from Jazz Pharmaceuticals Inc.
How long has Dr. Fadi Samir Tahhan been practicing?
Dr. Tahhan graduated from medical school in 2020, 6 years ago.
What insurance does Dr. Fadi Samir Tahhan accept?
Dr. Tahhan is in network with 2 carriers, including Molina and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
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