Cara O'Brien, M.D.
NPI 1720407893 · Geriatric Medicine (Internal Medicine) Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cara O'Brien, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider in Milwaukee, WI (NPI 1720407893).
Provider details
- NPI number
- 1720407893
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 64832 (WI)
Specialties & taxonomies
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
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
277 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 | 79 | $15 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 70 | $90 |
| Residence Visit for Established Patient With High Level of Medical Decision Making, Per Day, If Using Time, at Least 60 Minutes99350 | 50 | $175 |
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 | 34 | $121 |
| Assessment of and Care Planning for Patient With Impaired Thought Processing, Typically 60 Minutes99483 | 23 | $180 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 74 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sertraline Hcl | 294 | 71 |
| Amlodipine Besylate | 289 | 47 |
| Levothyroxine Sodium | 256 | 42 |
| Atorvastatin Calcium | 244 | 45 |
| Memantine Hcl | 213 | 33 |
| Mirtazapine | 175 | 38 |
| Lisinopril | 169 |
Practice location
Mailing address
Additional practice locations (1)
- 10101 W Wisconsin AveMilwaukee, WI 53226-4861Phone: (414) 454-8460Fax: (414) 454-8459
Registry dates
- Enumerated
- 2014-04-15
- Last updated
- 2023-09-11
- Certified
- 2023-09-11
Frequently asked questions
- What is Cara O'Brien's NPI number?
- Cara O'Brien's National Provider Identifier (NPI) is 1720407893, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cara O'Brien's specialty?
- Cara O'Brien is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Cara O'Brien located?
- Cara O'Brien's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226.
- What is Cara O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Cara O'Brien is (414) 805-6850.
- Does Cara O'Brien accept Medicare?
- Cara 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 Cara O'Brien's NPI active?
- Yes — Cara O'Brien's NPI (1720407893) is active in the NPPES registry as of the last update on 2023-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.