Daniel O'Brien, M.D.
NPI 1548659980 · Transplant Surgery Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel O'Brien, M.D. is a Transplant Surgery Physician provider in Milwaukee, WI (NPI 1548659980).
Provider details
- NPI number
- 1548659980
- Entity type
- Individual
- Primary specialty
- Transplant Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A173264 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
375 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 129 | $71 |
| 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'SG2211 | 103 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 88 | $102 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 15 | $129 |
| Transplantation of Donor Kidney50360 | 14 | $2,659 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 69 | 25 |
| Valganciclovir Hcl | 52 | 20 |
| Mycophenolate Sodiumbrand: Mycophenolic Acid | 12 | — |
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 (3)
- 200 Ucla Medical Plz Ste 214Los Angeles, CA 90095-5611Phone: (310) 825-8138
- 1800 W Superior St3sChicago, IL 60622-5611Phone: (847) 903-1336
- 4400 W 95th St Ste 112Oak Lawn, IL 60453-2657Phone: (708) 684-7100Fax: (708) 684-7130
Registry dates
- Enumerated
- 2015-01-22
- Last updated
- 2023-10-19
- Certified
- 2023-10-19
Frequently asked questions
- What is Daniel O'Brien's NPI number?
- Daniel O'Brien's National Provider Identifier (NPI) is 1548659980, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel O'Brien's specialty?
- Daniel O'Brien is listed in the NPPES registry with a primary specialty of Transplant Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel O'Brien located?
- Daniel O'Brien's practice location on file with NPPES is 2900 W Oklahoma Ave, Milwaukee, WI 53215-4330.
- What is Daniel O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Daniel O'Brien is (414) 649-6000.
- Does Daniel O'Brien accept Medicare?
- Daniel O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel O'Brien's NPI active?
- Yes — Daniel O'Brien's NPI (1548659980) is active in the NPPES registry as of the last update on 2023-10-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.