Daniel Riordan, D.O.
NPI 1174545891 · Internal Medicine Physician · Muskego, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel Riordan, D.O. is a Internal Medicine Physician provider in Muskego, WI (NPI 1174545891).
Provider details
- NPI number
- 1174545891
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 49311 (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
19 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
689 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 269 | $120 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 127 | $86 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 99 | $121 |
| Admn Sarscov2 Vacc 1 Dose90480 | 48 | $41 |
| Administration of Influenza Virus VaccineG0008 | 44 | $30 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 28 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 115 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 529 | 159 |
| Amlodipine Besylate | 372 | 123 |
| Losartan Potassium | 367 | 125 |
| Levothyroxine Sodium | 340 | 90 |
| Pantoprazole Sodium | 227 | 69 |
| Lisinopril | 215 | 70 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-24
- Last updated
- 2025-01-29
- Certified
- 2025-01-29
Frequently asked questions
- What is Daniel Riordan's NPI number?
- Daniel Riordan's National Provider Identifier (NPI) is 1174545891, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel Riordan's specialty?
- Daniel Riordan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel Riordan located?
- Daniel Riordan's practice location on file with NPPES is S69w15636 Janesville Rd, Muskego, WI 53150-9330.
- What is Daniel Riordan's phone number?
- The practice phone number listed in the NPPES registry for Daniel Riordan is (262) 928-7000.
- Does Daniel Riordan accept Medicare?
- Daniel Riordan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel Riordan's NPI active?
- Yes — Daniel Riordan's NPI (1174545891) is active in the NPPES registry as of the last update on 2025-01-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.