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Dr. William R. Frederick, MD
NPI1932124682
- Part D claims, 2018
- 72
- Publications
- 1
- Industry payments
- $10
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 106 Irving St Nw, Washington, DC 20010-2927
- Practice phone
- Call (202) 877-7788
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Frederick C. Finelli
Multi-specialty group site · Washington, District of Columbia
Find Dr. Frederick'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. William R. Frederick is an internist in San Diego, California
Dr. Frederick practices at Frederick C. Finelli in Washington, District of Columbia.
Dr. Frederick's NPI, 1932124682, was assigned on July 13, 2006. Dr. Frederick holds District of Columbia license 4502.
NPI and contact details
- NPI
- 1932124682NPI Registry (opens in a new tab)
- NPI enumeration date
- July 13, 2006
- NPI status
- Active
- Practice phone
- (202) 877-7788
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William R. Frederick practices in Washington and San Diego
Dr. Frederick's primary practice is Frederick C. Finelli, at 106 Irving St Nw, Washington, DC 20010-2927. The practice phone is (202) 877-7788. The NPI Registry lists Dr. Frederick's practice address as 200 W Arbor Dr, San Diego, CA 92103.
- Frederick C. FinelliPrimary106 Irving St Nw, Washington, DC 20010-2927Phone(202) 877-7788
- NPI Registry address200 W Arbor Dr, San Diego, CA 92103 · San Diego CountyPhone(202) 291-6423
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. William R. Frederick is affiliated with 1 site of care and 1 medical group
Dr. Frederick's primary practice is Frederick C. Finelli in Washington, District of Columbia. Dmand AI also links Dr. Frederick to 1 medical group, named with a free account.
Frederick C. FinelliPrimary
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. William R. Frederick's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Frederick practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Frederick C. Finelli | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William R. Frederick is one of 16,751 internists in California
Internal medicine is Dr. Frederick's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Frederick's licenses on file in 3 states: District of Columbia, Maryland and Virginia.
Specialties and state licenses
- Internal medicine, District of ColumbiaPrimary
- Maryland license
- Virginia license
Internists near Dr. Frederick
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. William R. Frederick's patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Frederick's median patient age at 65, with 75% women.
Dr. Frederick'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
- Women75%
- Men25%
Source: Dmand AI Patient Panel Data
Dr. William R. Frederick wrote 72 Medicare Part D claims in 2018
In 2018, Dr. Frederick wrote 72 Medicare Part D claims. They cover 5 drugs, with $1,466 in total drug cost. In 2017, CMS named 128 claims across 10 drugs.
Part D claims, 201872
Drugs named by CMS5
Total drug cost$1,466
Dr. Frederick's most prescribed drugs by claims, 2018
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, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 1282018: 7244%
Drugs named by CMS: 5 in 2018, 10 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. William R. Frederick has 1 publication on record
Dmand AI links 1 paper to Dr. Frederick. Dr. Frederick's most frequent co-authors are Salim Salaheddin Abunnaja, MD and Scott Bartholomew McCusker, MD.
Papers1
Dr. Frederick's most frequent co-authors
Recent publications by Dr. Frederick
See who Dr. Frederick researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Frederick works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William R. Frederick received $10 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Frederick from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $10.
Companies that paid Dr. Frederick the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William R. Frederick'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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) |
| 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. William R. Frederick
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. William R. Frederick's NPI number?
Dr. William R. Frederick's NPI number is 1932124682. It was assigned on July 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William R. Frederick?
Dr. William R. Frederick is an internist in San Diego, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William R. Frederick practice?
Dr. Frederick practices at 106 Irving St Nw, Washington, DC 20010-2927. Dr. Frederick also practices at 200 W Arbor Dr, San Diego, CA 92103. Dr. Frederick's primary practice is Frederick C. Finelli in Washington, District of Columbia. Dmand AI also links Dr. Frederick to 1 medical group.
What is Dr. William R. Frederick's office phone number?
The practice phone on file for Dr. Frederick is (202) 877-7788.
What is Dr. William R. Frederick's medical license number?
Dr. Frederick holds District of Columbia license 4502, one of the licenses on file in 3 states.
Which states has Dr. William R. Frederick been licensed in?
Dmand AI has state licenses on file for Dr. Frederick in District of Columbia, Maryland and Virginia.
What drugs does Dr. William R. Frederick prescribe most?
In 2018 Medicare Part D data, Dr. Frederick's most prescribed drugs by claims were Atorvastatin Calcium, Clopidogrel and Escitalopram Oxalate.
Has Dr. William R. Frederick received payments from drug or device companies?
CMS Open Payments shows $10 in general payments to Dr. Frederick from 1 company from 2017 to 2017. The largest total came from Pfizer Inc.
How long has Dr. William R. Frederick been practicing?
Dr. Frederick's NPI was assigned in 2006.
Does Dr. William R. Frederick do research?
Dmand AI links 1 publication to Dr. Frederick.
Who does Dr. William R. Frederick publish with?
Dr. Frederick's most frequent co-authors are Salim Salaheddin Abunnaja, MD (1 shared paper) and Scott Bartholomew McCusker, MD (1 shared paper).
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