Karen Lynn Knudsen, MD
Endocrinology, Diabetes & Metabolism Physician · Williamsburg, VA
Karen Lynn Knudsen, MD is an endocrinology, diabetes & metabolism physician with a practice address in Williamsburg, Virginia, and NPI 1659574309, issued on Jun 8, 2007. Check the license (Virginia 0101247423, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Karen Lynn Knudsen
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 0101247423 VA
Self-reported in NPPES; status is on the state search - Practice location
- 5424 Discovery Park Boulevard, Williamsburg, VA 23188
- Phone
- (757) 903-4808
- Enumerated
- Jun 8, 2007
- Record last updated
- Dec 5, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (757) 707-3507
- Medicare enrollment
- Enrolled (PECOS I20101101001113); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 264 in Virginia → Look up another NPI →
Also registered at 5424 Discovery Park Boulevard
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mackenzie DumphyPhysical Therapist1235978172
- Kathy Green, MSN, FNP-BCFamily Nurse Practitioner1295287639
- Frances Jones, M.D.Gastroenterology Physician1952590408
- Jody Lyle, CRNACertified Registered Nurse Anesthetist1265764310
Verify Karen Lynn Knudsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101247423Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
1,637 Medicare Part D claims for 352 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 52% of claims.
Most prescribed
- Levothyroxine Sodium316 claims
- Synthroid243 claims
- Methimazole131 claims
- Metformin Hcl Er71 claims
- Metformin Hcl66 claims
- Ozempic53 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $687.89
25 payments; by number, the most common kind was food and beverage; the largest payer was Insulet Corporation. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Tidewater Physicians Multispecialty Group, PCNewport News, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Lynn Knudsen among 264 endocrinology, diabetes & metabolism physician records in Virginia
Karen Lynn Knudsen, MD is one of 264 endocrinology, diabetes & metabolism physician records with a practice address in Virginia. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 42% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1999 · median 2004 among the 188 with a school on file
- Record last updated2019 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Virginia
There are 264 endocrinology, diabetes & metabolism physician records in Virginia.
All 264 in Virginia → Every provider in Williamsburg → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Katherine Roberts, M.D.Williamsburg, VA 231881437348851
- Matthew Laroe, M.D.Williamsburg, VA 231851598290454
- Abel Yimer, M.D.Williamsburg, VA 231851053767392
- Richard Atkinson, MDRichmond, VA 232191932403748
- Harvey Lankford, MDRichmond, VA 232251558469569
- Mary Gordon Brown, NPCRichmond, VA 232261154470458
- Robert Castellucci, MDRichmond, VA 232261952336026
- Colette Moussalli, MDRichmond, VA 232291871541383
Common questions
What is Karen Lynn Knudsen, MD's NPI number?
Karen Lynn Knudsen, MD's National Provider Identifier (NPI) is 1659574309, issued on Jun 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen Lynn Knudsen, MD located?
The NPPES record lists a practice address at 5424 Discovery Park Boulevard, Williamsburg, VA, 23188. Phone: (757) 903-4808. Providers update this record themselves, so call before visiting.
How can I verify Karen Lynn Knudsen, MD's license?
NPPES lists Virginia license number 0101247423, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Karen Lynn Knudsen, MD prescribe under Medicare Part D?
In 2024, Karen Lynn Knudsen, MD had 1,637 Medicare Part D claims for 352 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.