Ryan Holzmacher, MD
NPI 1598700601 · Internal Medicine Physician · Greenfield, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ryan Holzmacher, MD is a Internal Medicine Physician provider in Greenfield, WI (NPI 1598700601).
Provider details
- NPI number
- 1598700601
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 42642-020 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
4,130 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 | 2,879 | $73 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 383 | $110 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 345 | $160 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 319 | $100 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 110 | $169 |
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-20
- Last updated
- 2024-09-20
- Certified
- 2024-09-20
Frequently asked questions
- What is Ryan Holzmacher's NPI number?
- Ryan Holzmacher's National Provider Identifier (NPI) is 1598700601, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ryan Holzmacher's specialty?
- Ryan Holzmacher is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ryan Holzmacher located?
- Ryan Holzmacher's practice location on file with NPPES is 5017 S 110th St, Greenfield, WI 53228-3131.
- What is Ryan Holzmacher's phone number?
- The practice phone number listed in the NPPES registry for Ryan Holzmacher is (414) 301-3531.
- Does Ryan Holzmacher accept Medicare?
- Ryan Holzmacher is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ryan Holzmacher's NPI active?
- Yes — Ryan Holzmacher's NPI (1598700601) is active in the NPPES registry as of the last update on 2024-09-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.