NPPES file of Aug 9, 2026

Nancy S. Knudsen, MD

Internal Medicine Physician · Amsterdam, NY

Nancy S. Knudsen, MD is an internal medicine physician with a practice address in Amsterdam, New York, and NPI 1003826025, issued on Aug 9, 2006. Check the license (New York 146433-1, as entered in NPPES) on the NYS Education Department, Office of the Professions; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1003826025
Name
Nancy S. Knudsen
Credential
MD
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
146433-1 NY
Self-reported in NPPES; status is on the state search
Practice location
427 Guy Park Ave, Amsterdam, NY 12010
Phone
(518) 842-1900
Enumerated
Aug 9, 2006
Record last updated
Aug 29, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(518) 841-7131
Medicaid ID
146433 NY
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →

Also registered at 427 Guy Park Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Eyad Aldaas, M.D.Family Medicine Physician1609131515
  2. Braelin AldiOccupational Therapist1174226807
  3. Lemuel ArriolaPsychiatry Physician1861667669
  4. Joshua Baker, PHARM. D.Pharmacist1669628715
  5. Sara Boerenko, LMSWSocial Worker1235304452
  6. Tiffany Boster, OTR/LOccupational Therapist1154048890

Verify Nancy S. Knudsen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
    Search for license 146433-1    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the New York license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

Nancy S. Knudsen among 12,067 internal medicine physician records in New York

Nancy S. Knudsen, MD is one of 12,067 internal medicine physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 8% of them.

  • NPI issued2006 · 8% of these records are older, 53% newer
  • In a Medicare fileNo · 79% of these records are
  • In the CMS Doctors and Clinicians fileNo · 60% of these records are
  • Record last updated2007 · 61% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

11 internal medicine physician records list a practice address in Amsterdam

They are 11 of the 472 NPPES records with a practice address in Amsterdam, and 12,067 internal medicine physician records in New York. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 12,067 in New York → Every provider in Amsterdam → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Brij Bajaj, MDAmsterdam, NY 120101780734939
  2. David Boice, D.O.Amsterdam, NY 120101154170710
  3. C Dawson, MDAmsterdam, NY 120101316930605
  4. Emily Etzkorn, M.D.Amsterdam, NY 120101871554543
  5. Michael Hardies, MDAmsterdam, NY 120101497754972
  6. Soo Lee, MDAmsterdam, NY 120101063476398
  7. Hafeez Rehman, M.D.Amsterdam, NY 120101396761474
  8. Clara Shnaidman, M.D.Amsterdam, NY 120101801050117

Common questions

What is Nancy S. Knudsen, MD's NPI number?

Nancy S. Knudsen, MD's National Provider Identifier (NPI) is 1003826025, issued on Aug 9, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Nancy S. Knudsen, MD located?

The NPPES record lists a practice address at 427 Guy Park Ave, Amsterdam, NY, 12010. Phone: (518) 842-1900. Providers update this record themselves, so call before visiting.

How can I verify Nancy S. Knudsen, MD's license?

NPPES lists New York license number 146433-1, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.