Mark William Guelzow, MD
Family Medicine Physician · Fayetteville, NY
Mark William Guelzow, MD is a family medicine physician with a practice address in Fayetteville, New York, and NPI 1124477484, issued on Jun 8, 2016. Check the license (New York 301689, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark William Guelzow
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 301689 NY
Self-reported in NPPES; status is on the state search - Practice location
- 4101 Medical Center Dr Ste 1C, Fayetteville, NY 13066
- Phone
- (315) 637-7878
- Enumerated
- Jun 8, 2016
- Record last updated
- Jul 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20191220000187); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,417 in New York → Look up another NPI →
Verify Mark William Guelzow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 301689Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average family medicine physician in 2024
2,945 Medicare Part D claims for 373 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium243 claims
- Rosuvastatin Calcium234 claims
- Amlodipine Besylate198 claims
- Levothyroxine Sodium146 claims
- Losartan Potassium142 claims
- Lisinopril104 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: $65.06
3 payments; by number, the most common kind was food and beverage; the largest payer was Exact Sciences Corporation. The 55,478 providers of this specialty with any payment received $902.55 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
- Chs Physician Partners PCRoslyn, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark William Guelzow among 6,417 family medicine physician records in New York
Mark William Guelzow, MD is one of 6,417 family medicine physician records with a practice address in New York. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 74% of them.
- NPI issued2016 · 74% of these records are older, 23% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2016 · median 2007 among the 4,188 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
33 family medicine physician records list a practice address in Fayetteville
They are 33 of the 450 NPPES records with a practice address in Fayetteville, and 6,417 family medicine physician records in New York.
All 6,417 in New York → Every provider in Fayetteville → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Allan Birnbaum, MDFayetteville, NY 130661184685018
- Chanele Burgun, MDFayetteville, NY 130661619954823
- Julie Colvin, MDFayetteville, NY 130661881655215
- Deann Cummings, MD.Fayetteville, NY 130661154356996
- William Dibble, DOFayetteville, NY 130661356301774
- Andrew Finley, MDFayetteville, NY 130661396748414
- Stephen Hoag, MDFayetteville, NY 130661740254242
- Lynne Humphrey, MD.Fayetteville, NY 130661487614988
Common questions
What is Mark William Guelzow, MD's NPI number?
Mark William Guelzow, MD's National Provider Identifier (NPI) is 1124477484, issued on Jun 8, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Mark William Guelzow, MD located?
The NPPES record lists a practice address at 4101 Medical Center Dr Ste 1C, Fayetteville, NY, 13066. Phone: (315) 637-7878. Providers update this record themselves, so call before visiting.
How can I verify Mark William Guelzow, MD's license?
NPPES lists New York license number 301689, 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 Mark William Guelzow, MD prescribe under Medicare Part D?
In 2024, Mark William Guelzow, MD had 2,945 Medicare Part D claims for 373 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.