Nathan Grunwald, MD
NPI 1073549887 · Family Medicine Physician · Menasha, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Grunwald, MD is a Family Medicine Physician provider in Menasha, WI (NPI 1073549887).
Provider details
- NPI number
- 1073549887
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 47609-020 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,193 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 249 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 218 | $119 |
| Blood Test, Basic Group of Blood Chemicals (calcium, Total)80048 | 149 | $8 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 145 | $13 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 80 | $122 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 93 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 797 | 213 |
| Amlodipine Besylate | 501 | 141 |
| Losartan Potassium | 291 | 86 |
| Omeprazole | 245 | 70 |
| Metoprolol Succinate | 238 | 66 |
| Lisinopril | 234 | 70 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-23
- Last updated
- 2012-03-13
Frequently asked questions
- What is Nathan Grunwald's NPI number?
- Nathan Grunwald's National Provider Identifier (NPI) is 1073549887, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathan Grunwald's specialty?
- Nathan Grunwald is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Grunwald located?
- Nathan Grunwald's practice location on file with NPPES is 2005 Midway Rd, Menasha, WI 54952-7002.
- What is Nathan Grunwald's phone number?
- The practice phone number listed in the NPPES registry for Nathan Grunwald is (920) 832-8500.
- Does Nathan Grunwald accept Medicare?
- Nathan Grunwald is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathan Grunwald's NPI active?
- Yes — Nathan Grunwald's NPI (1073549887) is active in the NPPES registry as of the last update on 2012-03-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.