NPPES file of Aug 9, 2026

Katherine Seibert, M.D.

Internal Medicine Physician · Monticello, NY

Katherine Seibert, M.D. is an internal medicine physician with a practice address in Monticello, New York, and NPI 1982616991, issued on Aug 12, 2006. Check the license (New York 133006, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1982616991
Name
Katherine Seibert
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
133006 NY
Self-reported in NPPES; status is on the state search
Practice location
23 Lakewood Ave, Monticello, NY 12701
Phone
(845) 794-2010
Enumerated
Aug 12, 2006
Record last updated
Dec 20, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(845) 794-4569
Medicaid ID
00942118 NY
Medicare enrollment
Enrolled (PECOS I20040621000642); accepts Medicare assignment
Medical or professional school
Creighton University School Of Medicine, 1976
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 23 Lakewood Ave

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

  1. Khorsheda Ali, D.O.Obstetrics Physician1134338122
  2. Lynn Guiser, M.S., R.D.Registered Dietitian1255506986
  3. Rachel Hale, CNMMidwife1760861488
  4. Norma O'Brien, FNPFamily Nurse Practitioner1861574311
  5. Olena Prokopov, FNPFamily Nurse Practitioner1659067221

Verify Katherine Seibert 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 133006    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

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94% fewer Medicare Part D claims than the average internal medicine physician in 2024

205 Medicare Part D claims for 61 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.

  1. Katherine Seibert205
  2. Specialty average3,176

Most prescribed

  1. Rosuvastatin Calcium23 claims
  2. Atorvastatin Calcium19 claims
  3. Metformin Hcl17 claims
  4. Levothyroxine Sodium16 claims
  5. Lisinopril11 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.

Bills Medicare through one group practice

  1. Sun River Health Inc.Peekskill, NY

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Internal Medicine Physician providers in New York

There are 12,067 internal medicine physician records in New York.

All 12,067 in New York → Every provider in Monticello →

Other internal medicine physician records in New York

  1. Deborah Aanonsen, D.O.Staten Island, NY1952395717
  2. Nivedita Aanur, M.D.New York, NY1982833471
  3. Jay Aaron, MDGreat Neck, NY1245332956
  4. Ahmad AbadiPoughkeepsie, NY1780258517
  5. Jamsheed Abadi, MDBrooklyn, NY1477537496
  6. Antonieta Abarientos, MDNew Rochelle, NY1649285123
  7. Zurab Abayev, M.D.Brooklyn, NY1841283058
  8. Ehab Abaza, MDNew York, NY1114507555
  9. Vaidarshi Abbagoni, MDNew York, NY1871237495
  10. Muhammad AbbasRichmond Hill, NY1053996587

Common questions

What is Katherine Seibert, M.D.'s NPI number?

Katherine Seibert, M.D.'s National Provider Identifier (NPI) is 1982616991, issued on Aug 12, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Katherine Seibert, M.D. located?

The NPPES record lists a practice address at 23 Lakewood Ave, Monticello, NY, 12701. Phone: (845) 794-2010. Providers update this record themselves, so call before visiting.

How can I verify Katherine Seibert, M.D.'s license?

NPPES lists New York license number 133006, 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.

How much does Katherine Seibert, M.D. prescribe under Medicare Part D?

In 2024, Katherine Seibert, M.D. had 205 Medicare Part D claims for 61 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.

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.