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JUSTIN CHRISTOPHER GRUBBS
NPI 1023495975
Anesthesiology in San Francisco, CA

Active since April 29, 2015PECOS EnrolledAccepts Medicare Assignment
239 MOUNT VERNON AVE, SAN FRANCISCO, CA 94112(808) 429-6979 Get Directions Write a Review

NPPES record last updated: October 26, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 26, 2023, Jun 17, 2016 (2 updates tracked since 2016).

About Justin Christopher Grubbs NPPES

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

JUSTIN CHRISTOPHER GRUBBS (NPI 1023495975) is an individual anesthesiology provider in San Francisco, California, licensed in California (167111) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS and is a graduate of Other (2015).

NPPES Registry Identity

NPI1023495975
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameJUSTIN CHRISTOPHER GRUBBS
Location Address239 MOUNT VERNON AVESan Francisco, CA 94112-3631
Mailing Address239 Mount Vernon AveSan Francisco, CA 94112-3631 · (808) 429-6979
Phone(808) 429-6979
Sole ProprietorYes
Medical School CMSOtherGraduated 2015
Enumeration DateApril 29, 2015
Last NPPES UpdateOctober 26, 20232 updates tracked since enumeration
NPPES CertifiedOctober 26, 2023
✔ NPI 1023495975 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in CA · 167111
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
239 MOUNT VERNON AVE, San Francisco, CA 94112
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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

Justin Christopher Grubbs 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 ID1759699226
PECOS Enrollment IDI20230519000749
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

4

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

University Anesthesia Medical Group
3.2 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
3.3 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
3.3 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
Anesthesia Care Associates Medical Group Inc
10 mi
Anesthesiology
1783 EL CAMINO REAL
Burlingame, CA 94010
  • Reassigned Medicare billing, California enrollment
  • 115 clinicians in this Medicare group
NPI 1215985023 (650) 696-5400

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 3

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.

Anesthesia for lens surgery 00142
Anesthesia for lens surgery involves administering medication to numb the eye area, ensuring you feel no pain during the procedure. This can be a local anesthetic (numbing only the eye area) or general (where you're asleep). It helps make the surgery comfortable and stress-free.
45 services45 patients
Ultrasonic guidance for blood vessel access 76937
Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.
14 services13 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.
13 services13 patients

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Justin Grubbs's NPI number?

The NPI number for Justin Grubbs is 1023495975. It was assigned to this individual provider in the NPPES registry on April 29, 2015.

Where is Justin Grubbs located?

Justin Grubbs practices at 239 Mount Vernon Ave, San Francisco, CA 94112. The listed phone number is (808) 429-6979.

What is Justin Grubbs's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Justin Grubbs enrolled in Medicare?

Yes. Justin Grubbs is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Justin Grubbs's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Justin Grubbs reassigns Medicare benefits to 4 organizations: University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Anesthesia Care Associates Medical Group Inc (Burlingame, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Justin Grubbs's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Justin Grubbs was last updated on October 26, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.