Connor O'Brien, M.D.
NPI 1063788727 · Critical Care Medicine (Internal Medicine) Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Connor O'Brien, M.D. is a Critical Care Medicine (Internal Medicine) Physician provider in San Francisco, CA (NPI 1063788727).
Provider details
- NPI number
- 1063788727
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A126717 (CA)
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 tenure25% of score
14 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
631 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 391 | $231 |
| Critical Care, Each Additional 30 Minutes99292 | 160 | $116 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 30 | $132 |
| Insertion of Non-Tunneled Central Venous Tube for Infusion (5 Years Or Older)36556 | 18 | $89 |
| Insertion of Artery Tube for Blood Sampling Or Infusion Through Skin36620 | 18 | $47 |
| Insertion of Tube in Pulmonary Artery for Monitoring93503 | 14 | $92 |
Typical Medicare-allowed amounts for these services range $47–$231 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$336 across 5 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
- 2012-03-27
- Last updated
- 2021-09-16
- Certified
- 2021-09-16
Frequently asked questions
- What is Connor O'Brien's NPI number?
- Connor O'Brien's National Provider Identifier (NPI) is 1063788727, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Connor O'Brien's specialty?
- Connor O'Brien is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Connor O'Brien located?
- Connor O'Brien's practice location on file with NPPES is 535 Mission Bay Blvd S, San Francisco, CA 94143-2156.
- What is Connor O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Connor O'Brien is (415) 353-2873.
- Does Connor O'Brien accept Medicare?
- Connor 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 Connor O'Brien's NPI active?
- Yes — Connor O'Brien's NPI (1063788727) is active in the NPPES registry as of the last update on 2021-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.