Frank O'Brien, MD
NPI 1144774266 · Nephrology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Frank O'Brien, MD is a Nephrology Physician provider in Saint Louis, MO (NPI 1144774266).
Provider details
- NPI number
- 1144774266
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2017022825 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
237 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 60 | $76 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 57 | $123 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 38 | $82 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 36 | $337 |
| Urinalysis, Manual Test81002 | 17 | $3 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 102 | 17 |
| Chlorthalidone | 86 | 15 |
| Carvedilol | 75 | 17 |
| Losartan Potassium | 57 | 16 |
| Atorvastatin Calcium | 55 | — |
| Lisinopril | 37 | — |
| Levothyroxine Sodium | 36 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,530 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-08-05
- Last updated
- 2025-04-17
- Certified
- 2022-09-29
Frequently asked questions
- What is Frank O'Brien's NPI number?
- Frank O'Brien's National Provider Identifier (NPI) is 1144774266, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frank O'Brien's specialty?
- Frank O'Brien is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Frank O'Brien located?
- Frank O'Brien's practice location on file with NPPES is 4921 Parkview Pl, Saint Louis, MO 63110-1032.
- What is Frank O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Frank O'Brien is (314) 362-7603.
- Does Frank O'Brien accept Medicare?
- Frank 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 Frank O'Brien's NPI active?
- Yes — Frank O'Brien's NPI (1144774266) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.