DR. CONNOR GALEN O'BRIEN M.D.
NPI 1063788727
Internal Medicine - Critical Care Medicine in San Francisco, CA

Q: What is Connor O'brien's NPI number?

The NPI number for Connor O'brien is 1063788727. It was assigned to this individual provider in the NPPES registry on March 27, 2012.

Q: What is Connor O'brien's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

Q: When was this NPI record last updated?

The NPPES record for Connor O'brien was last updated on September 16, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 27, 2012PECOS EnrolledAccepts Medicare Assignment

535 MISSION BAY BLVD S, SAN FRANCISCO, CA 94143(415) 353-2873(415) 353-2528 Get Directions Write a Review

NPPES record last updated: September 16, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Dr. Connor Galen O'brien M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. CONNOR GALEN O'BRIEN M.D. (NPI 1063788727) is an individual critical care medicine provider in San Francisco, California, licensed in California (A126717) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS and is a graduate of Other (2012).

NPPES Registry Identity

NPI1063788727

Entity TypeIndividualMale

Primary Taxonomy207RC0200X

Provider Legal NameDR. CONNOR GALEN O'BRIENCredential: M.D.

Location Address535 MISSION BAY BLVD SSan Francisco, CA 94143-2156

Mailing Address535 Mission Bay Blvd SSan Francisco, CA 94143-2156 · (415) 353-2873 · Fax (415) 353-2528

Phone(415) 353-2873

Fax(415) 353-2528

Sole ProprietorNo

Medical School CMSOtherGraduated 2012

Enumeration DateMarch 27, 2012

Last NPPES UpdateSeptember 16, 2021

NPPES CertifiedSeptember 16, 2021

✔ NPI 1063788727 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Critical Care MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RC0200X

License✔ Licensed in CA · A126717

Definition

An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.

Also ListedInternal MedicineTaxonomy 207R00000X · License A126717 (CA)

Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License A126717 (CA)

535 MISSION BAY BLVD S, San Francisco, CA 94143

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Connor Galen O'brien M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1759708555

PECOS Enrollment IDI20200825001904

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Connor O'brien reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Regents Of The University Of California

2.9 mi

Endocrinology, Diabetes & Metabolism

1600 DIVISADERO ST
San Francisco, CA 94143

Reassigned Medicare billing, California enrollment
2,112 clinicians in this Medicare group

NPI 1235322348 (415) 353-9720

University Anesthesia Medical Group

3.7 mi

Anesthesiology

505 PARNASSUS AVE
San Francisco, CA 94143

Reassigned Medicare billing, California enrollment
723 clinicians in this Medicare group

NPI 1528137296 (415) 476-1000

University Of California San Francisco

3.7 mi

Surgery

400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143

Reassigned Medicare billing, California enrollment
5,645 clinicians in this Medicare group

NPI 1346329380 (415) 353-2161

Ucsf Medical Group Business Services

3.7 mi

Internal Medicine

400 PARNASSUS AVE
San Francisco, CA 94122

Reassigned Medicare billing, California enrollment
5,544 clinicians in this Medicare group

NPI 1477624104 (415) 353-2808

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

391 services133 patients

Critical care, each additional 30 minutes 99292

Critical care refers to special attention given to patients facing life-threatening conditions. Each additional 30 minutes indicates the extension of this specialized care. This might include close monitoring, medication adjustments, and immediate interventions as needed.

160 services54 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

30 services20 patients

Insertion of non-tunneled central venous tube for infusion (5 years or older) 36556

This procedure involves placing a thin tube into a large vein, usually in the neck or chest, to administer medication or fluids. It's done under local anesthesia to minimize discomfort. It's a standard, safe procedure for individuals aged 5 and above.

18 services18 patients

Insertion of artery tube for blood sampling or infusion through skin 36620

This procedure involves placing a small tube into an artery, usually in the wrist or elbow, to collect blood samples or administer medication. It's done under local anesthesia and is a common, safe practice.

18 services18 patients

Insertion of tube in pulmonary artery for monitoring 93503

This procedure involves placing a tube into your pulmonary artery, which is a blood vessel in your lungs. The tube helps monitor heart function and blood flow, providing vital information for your treatment. It's typically done under local anesthesia to minimize discomfort.

14 services14 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$153.83 typical visit price

range $69.00 – $202.35

Typical copayment $38.45 (range $17.25 – $50.58)

Most-billed visit code 99204

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. LARA KRISA HOYLE ELGIN FNP-BC, MPH

Nurse Practitioner (Family)