Zackary Franzen, MD
NPI 1851851018 · Internal Medicine Physician · Rockford, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zackary Franzen, MD is a Internal Medicine Physician provider in Rockford, IL (NPI 1851851018).
Provider details
- NPI number
- 1851851018
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
778 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 383 | $76 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 130 | $110 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 102 | $115 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 82 | $168 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 32 | $48 |
| Critical Care, First 30-74 Minutes99291 | 28 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 25 | 24 |
| Prednisone | 18 | 17 |
| Furosemide | 12 | 12 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 12 | 12 |
| Metoprolol Tartrate | 11 | — |
| Spironolactone | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include 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 , 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 (3)
- 800 Meadows RdBoca Raton, FL 33486-2304Phone: (561) 955-5365
- 670 Glades Rd Ste 400Boca Raton, FL 33431-6464Phone: (561) 955-2570Fax: (561) 955-2572
- 5666 E State StRockford, IL 61108-2425Phone: (815) 226-2000
Registry dates
- Enumerated
- 2019-03-23
- Last updated
- 2022-07-28
- Certified
- 2022-07-28
Frequently asked questions
- What is Zackary Franzen's NPI number?
- Zackary Franzen's National Provider Identifier (NPI) is 1851851018, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zackary Franzen's specialty?
- Zackary Franzen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Zackary Franzen located?
- Zackary Franzen's practice location on file with NPPES is 5666 E State St, Rockford, IL 61108-2425.
- What is Zackary Franzen's phone number?
- The practice phone number listed in the NPPES registry for Zackary Franzen is (815) 226-2000.
- Does Zackary Franzen accept Medicare?
- Zackary Franzen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zackary Franzen's NPI active?
- Yes — Zackary Franzen's NPI (1851851018) is active in the NPPES registry as of the last update on 2022-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.