Tammy O'Brien, M.D.
NPI 1184703571 · Family Medicine Physician · Cedar Rapids, IA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tammy O'Brien, M.D. is a Family Medicine Physician provider in Cedar Rapids, IA (NPI 1184703571).
Provider details
- NPI number
- 1184703571
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 31465 (IA)
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
534 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) |
|---|---|---|
| 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 | 164 | $15 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 127 | $117 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 69 | $119 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 47 | $166 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 43 | $84 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 84 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 278 | 69 |
| Atorvastatin Calcium | 136 | 37 |
| Gabapentin | 102 | 25 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 98 | 20 |
| Lisinopril | 88 | 21 |
| Semaglutidebrand: Ozempic | 88 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-04
- Last updated
- 2023-07-25
- Certified
- 2023-07-25
Frequently asked questions
- What is Tammy O'Brien's NPI number?
- Tammy O'Brien's National Provider Identifier (NPI) is 1184703571, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tammy O'Brien's specialty?
- Tammy O'Brien is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tammy O'Brien located?
- Tammy O'Brien's practice location on file with NPPES is 500 8th Ave Se, Cedar Rapids, IA 52401-2134.
- What is Tammy O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Tammy O'Brien is (319) 364-8704.
- Does Tammy O'Brien accept Medicare?
- Tammy 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 Tammy O'Brien's NPI active?
- Yes — Tammy O'Brien's NPI (1184703571) is active in the NPPES registry as of the last update on 2023-07-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.