Karen Knudsen, MD
NPI 1659574309 · Endocrinology, Diabetes & Metabolism Physician · Williamsburg, VA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1659574309
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 0101247423 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
4,482 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 957 | $123 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 558 | $9 |
| Blood Test, Thyroid Stimulating Hormone (tsh)84443 | 525 | $16 |
| Thyroxine (thyroid Chemical), Free84439 | 490 | $9 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 212 | $16 |
| Ultrasound Scan of Head and Neck Soft Tissue76536 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 316 | 99 |
| Levothyroxine Sodiumbrand: Synthroid | 243 | 71 |
| Methimazole | 131 | 45 |
| Metformin Hclbrand: Metformin Hcl Er | 71 | 26 |
| Metformin Hcl | 66 | 23 |
| Semaglutidebrand: Ozempic | 53 | 20 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$688 across 25 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 704 Thimble Shoals BlvdSuite 300aNewport News, VA 23606-4544Phone: (757) 595-4300Fax: (757) 591-9297
Registry dates
- Enumerated
- 2007-06-08
- Last updated
- 2019-12-05
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.