Quick answers
- Does Karen L. Knudsen accept Medicare assignment?
- Yes. Medicare's clinician data says Karen L. Knudsen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Karen L. Knudsen see?
- In 2024, CMS data shows 706 Original Medicare patients and 4,552 services for Karen L. Knudsen. This counts Original Medicare only and measures volume, not quality.
- What is Karen L. Knudsen's NPI number?
- 1659574309. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Karen L. Knudsen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 706 |
|---|---|
| Services billed to Medicare | 4,552 |
| Different services or procedures | 51 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)957 services
- Insertion of needle into vein for collection of blood sample (36415)558 services
- Blood test, thyroid stimulating hormone (tsh) (84443)525 services
- Thyroxine (thyroid chemical), free (84439)490 services
- 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's (G2211)212 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure71%
- Arthritis50%
- Diabetes33%
- Osteoporosis30%
- Anxiety21%
Hospitals where Karen L. Knudsen works
Medicare's Facility Affiliation Data lists Karen L. Knudsen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Riverside Doctors' Hospital of WilliamsburgWilliamsburg, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490143
- Riverside Regional Medical CenterNewport News, VA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 490052
- Riverside Walter Reed HospitalGloucester, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490130
- Sentara Careplex HospitalHampton, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490093
- Sentara Williamsburg Regional Medical CenterWilliamsburg, VA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 490066
Practice locations
Addresses where Karen L. Knudsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 12655 Warwick Blvd, Suite BNewport News, VA 23606 (757) 595‑3570
- 12655 Warwick Blvd ANewport News, VA 23606 (757) 595‑9880
- 408 16th StWest Point, VA 23181 (804) 843‑3131
- 4125 Ironbound Rd, Suite 200Williamsburg, VA 23188 (757) 345‑2829
- 860 Omni BlvdNewport News, VA 23606
Group practices
Medicare enrollment lists Karen L. Knudsen as a member of this group (CMS data updated October 2, 2026).
- Tidewater Physicians Multispecialty Group, PC261 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in Newport News
Clinicians with the same Medicare primary specialty in Newport News, VA — not a recommendation.
Other clinicians in Tidewater Physicians Multispecialty Group, PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Yale University School Of Medicine |
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1659574309 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians