Nicholas Lettner-Knowlton, MD
NPI 1356075147 · Internal Medicine Physician · Saginaw, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nicholas Lettner-Knowlton, MD is a Internal Medicine Physician provider in Saginaw, MI (NPI 1356075147).
Provider details
- NPI number
- 1356075147
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301514040 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 27 | 13 |
| Lisinopril | 17 | 11 |
| Omeprazole | 15 | — |
| Tamsulosin Hcl | 12 | — |
| Pantoprazole Sodium | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-07-15
- Last updated
- 2026-01-09
- Certified
- 2026-01-09
Frequently asked questions
- What is Nicholas Lettner-Knowlton's NPI number?
- Nicholas Lettner-Knowlton's National Provider Identifier (NPI) is 1356075147, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicholas Lettner-Knowlton's specialty?
- Nicholas Lettner-Knowlton is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nicholas Lettner-Knowlton located?
- Nicholas Lettner-Knowlton's practice location on file with NPPES is 1015 S Washington Ave, Saginaw, MI 48601-2556.
- What is Nicholas Lettner-Knowlton's phone number?
- The practice phone number listed in the NPPES registry for Nicholas Lettner-Knowlton is (989) 746-7500.
- Does Nicholas Lettner-Knowlton accept Medicare?
- Nicholas Lettner-Knowlton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nicholas Lettner-Knowlton's NPI active?
- Yes — Nicholas Lettner-Knowlton's NPI (1356075147) is active in the NPPES registry as of the last update on 2026-01-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.