Nicholas John-James Lettner-Knowlton, MD
Internal Medicine Physician · Saginaw, MI
Nicholas John-James Lettner-Knowlton, MD is an internal medicine physician with a practice address in Saginaw, Michigan, and NPI 1356075147, issued on Jul 15, 2022. Check the license (Michigan 4301514040, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Nicholas John-James Lettner-Knowlton
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301514040 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1015 S Washington Ave, Saginaw, MI 48601
- Phone
- (989) 746-7500
- Enumerated
- Jul 15, 2022
- Record last updated
- Jan 9, 2026
- Fax
- (989) 746-7728
- Medicare enrollment
- Enrolled (PECOS I20250627003853); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 1015 S Washington Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nicholas John-James Lettner-Knowlton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301514040Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
353 Medicare Part D claims for 122 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium27 claims
- Lisinopril17 claims
- Omeprazole15 claims
- Tamsulosin Hcl12 claims
- Pantoprazole Sodium11 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
- Saginaw Cooperative Hospitals IncSaginaw, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nicholas John-James Lettner-Knowlton among 5,735 internal medicine physician records in Michigan
Nicholas John-James Lettner-Knowlton, MD is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 87% of them.
- NPI issued2022 · 87% of these records are older, 10% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2022 · median 2006 among the 3,564 with a school on file
- Record last updated2026 · 54% 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 Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
169 internal medicine physician records list a practice address in Saginaw
They are 169 of the 6,008 NPPES records with a practice address in Saginaw, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Saginaw → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Samer Abboud, MDSaginaw, MI 486011245804178
- Wasef Al-Khateeb, MDSaginaw, MI 486011740912138
- Reina Badran, MDSaginaw, MI 486011730609256
- Waseem Diab, MDSaginaw, MI 486011730753328
- Lakshmi Gowda Hanumaiah, MDSaginaw, MI 486011770714370
- Ayesha Khan, M.D.Saginaw, MI 486011275583882
- Sadia Khan, MDSaginaw, MI 486011881633048
- Muhammad Khan, M.D.Saginaw, MI 486011689771099
Common questions
What is Nicholas John-James Lettner-Knowlton, MD's NPI number?
Nicholas John-James Lettner-Knowlton, MD's National Provider Identifier (NPI) is 1356075147, issued on Jul 15, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Nicholas John-James Lettner-Knowlton, MD located?
The NPPES record lists a practice address at 1015 S Washington Ave, Saginaw, MI, 48601. Phone: (989) 746-7500. Providers update this record themselves, so call before visiting.
How can I verify Nicholas John-James Lettner-Knowlton, MD's license?
NPPES lists Michigan license number 4301514040, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nicholas John-James Lettner-Knowlton, MD prescribe under Medicare Part D?
In 2024, Nicholas John-James Lettner-Knowlton, MD had 353 Medicare Part D claims for 122 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.
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.