William Northquist
NPI 1104405349 · Internal Medicine Physician · Plainfield, IN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Northquist is a Internal Medicine Physician provider in Plainfield, IN (NPI 1104405349).
Provider details
- NPI number
- 1104405349
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
- License
- 01096875A (IN)
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
5 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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) |
|---|---|
| Pantoprazole Sodium | 17 |
| Empagliflozinbrand: Jardiance | 13 |
| Methocarbamol | 12 |
| Metoprolol Tartrate | 12 |
| Amitriptyline Hcl | 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
Additional practice locations (2)
- 1411 S Green StBrownsburg, IN 46112-2049Phone: (317) 852-3600Fax: (317) 858-4600
- 705 Riley Hospital Dr Rm 5837Indianapolis, IN 46202-5109Phone: (317) 948-0003
Registry dates
- Enumerated
- 2021-04-05
- Last updated
- 2025-08-19
- Certified
- 2025-08-19
Frequently asked questions
- What is William Northquist's NPI number?
- William Northquist's National Provider Identifier (NPI) is 1104405349, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Northquist's specialty?
- William Northquist is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Northquist located?
- William Northquist's practice location on file with NPPES is 1100 Southfield Dr Ste 1220, Plainfield, IN 46168-4499.
- What is William Northquist's phone number?
- The practice phone number listed in the NPPES registry for William Northquist is (317) 838-3443.
- Does William Northquist accept Medicare?
- William Northquist is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Northquist's NPI active?
- Yes — William Northquist's NPI (1104405349) is active in the NPPES registry as of the last update on 2025-08-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.