Demi O'Brien, MD
NPI 1700409828 · Family Medicine Physician · Greenfield, IA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Demi O'Brien, MD is a Family Medicine Physician provider in Greenfield, IA (NPI 1700409828).
Provider details
- NPI number
- 1700409828
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD-50804 (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
6 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
174 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 78 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 57 | $118 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 27 | $167 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 12 | $84 |
Typical Medicare-allowed amounts for these services range $9–$167 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 33 | 18 |
| Triamcinolone Acetonide | 27 | — |
| Lisinopril | 20 | — |
| Levothyroxine Sodium | 17 | — |
| Escitalopram Oxalate | 16 | — |
| Omeprazole | 15 | — |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-05-22
- Last updated
- 2025-02-17
- Certified
- 2025-02-17
Frequently asked questions
- What is Demi O'Brien's NPI number?
- Demi O'Brien's National Provider Identifier (NPI) is 1700409828, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Demi O'Brien's specialty?
- Demi O'Brien is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Demi O'Brien located?
- Demi O'Brien's practice location on file with NPPES is 288 Public Sq, Greenfield, IA 50849-1264.
- What is Demi O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Demi O'Brien is (641) 743-6529.
- Does Demi O'Brien accept Medicare?
- Demi 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 Demi O'Brien's NPI active?
- Yes — Demi O'Brien's NPI (1700409828) is active in the NPPES registry as of the last update on 2025-02-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.