Christina O'Brien, MD
NPI 1174052112 · Internal Medicine Physician · Mount Kisco, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christina O'Brien, MD is a Internal Medicine Physician provider in Mount Kisco, NY (NPI 1174052112).
Provider details
- NPI number
- 1174052112
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 317296 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
9 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
181 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 135 | $89 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 23 | $194 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 23 | $91 |
Typical Medicare-allowed amounts for these services range $89–$194 (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 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 14 | 12 |
| Furosemide | 11 | — |
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)
- 157 Union StMarlborough, MA 01752-1228Phone: (508) 486-5678Fax: (508) 486-5677
- 55 Lake Ave NWorcester, MA 01655Phone: (508) 334-1000
- 119 Belmont StWorcester, MA 01605-2903Phone: (508) 334-8515Fax: (508) 334-6490
Registry dates
- Enumerated
- 2017-06-05
- Last updated
- 2023-11-14
- Certified
- 2023-11-14
Frequently asked questions
- What is Christina O'Brien's NPI number?
- Christina O'Brien's National Provider Identifier (NPI) is 1174052112, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christina O'Brien's specialty?
- Christina O'Brien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Christina O'Brien located?
- Christina O'Brien's practice location on file with NPPES is 400 E Main St, Mount Kisco, NY 10549-3477.
- What is Christina O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Christina O'Brien is (302) 383-9764.
- Does Christina O'Brien accept Medicare?
- Christina 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 Christina O'Brien's NPI active?
- Yes — Christina O'Brien's NPI (1174052112) is active in the NPPES registry as of the last update on 2023-11-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.