GAGAN MAHAJAN M.D.
NPI 1144205063
Anesthesiology in Sacramento, CA

Q: What is Gagan Mahajan's NPI number?

The NPI number for Gagan Mahajan is 1144205063. It was assigned to this individual provider in the NPPES registry on December 13, 2005.

Q: What is Gagan Mahajan's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Gagan Mahajan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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 December 13, 2005PECOS EnrolledAccepts Medicare Assignment

90.92/100

CMS Quality Rating

4150 V ST, PSSB-SUITE 1200 - MED: ANESTHESIA, SACRAMENTO, CA 95817(916) 734-7985(916) 734-2975 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Gagan Mahajan M.d. NPPES

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

GAGAN MAHAJAN M.D. (NPI 1144205063) is an individual anesthesiology provider in Sacramento, California, licensed in California (A712730) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS and is a graduate of Pennsylvania State University College Of Medicine (1996).

NPPES Registry Identity

NPI1144205063

Entity TypeIndividualMale

Primary Taxonomy207L00000X

Provider Legal NameGAGAN MAHAJANCredential: M.D.

Location Address4150 V ST, PSSB-SUITE 1200 - MED: ANESTHESIASacramento, CA 95817-1460

Mailing Address4150 V St, Pssb-suite 1200 - Med: AnesthesiaSacramento, CA 95817-1460 · (916) 734-7985 · Fax (916) 734-2975

Phone(916) 734-7985

Fax(916) 734-2975

Sole ProprietorNo

Medical School CMSPennsylvania State University College Of MedicineGraduated 1996

Enumeration DateDecember 13, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1144205063 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207L00000X

License✔ Licensed in CA · A712730

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.

4150 V ST, Sacramento, CA 95817

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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

Gagan Mahajan 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 ID345303814

PECOS Enrollment IDI20090108000785

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 Gagan Mahajan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Regents Of The University Of Ca

0.6 mi

Hematology & Oncology

1508 ALHAMBRA BLVD
Sacramento, CA 95816

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Regents Of The Univ Of Ca
2,570 clinicians in this Medicare group

NPI 1528051679 (916) 734-5803

Regents Of The University Of California

0.8 mi

Multi-Specialty

3160 FOLSOM BLVD STE 1400
Sacramento, CA 95816

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

NPI 1962482513 (916) 734-7777

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 17

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

289 services215 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

150 services150 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

97 services86 patients

Injection of lower or sacral spine facet joint using imaging guidance, single level 64493

This procedure involves injecting medication into the facet joint in your lower back or sacral spine. It's done under imaging guidance to ensure accuracy. The aim is to alleviate pain and inflammation. It's a safe, often effective method for managing spinal discomfort.

85 services48 patients

Injection of substance into lower spine canal using imaging guidance 62323

This procedure involves injecting a substance into your lower spine canal, guided by real-time images. It's done to diagnose or treat various conditions. You may feel slight discomfort, but it's generally safe and can provide valuable information for your treatment plan.

80 services67 patients

Injection of lower or sacral spine facet joint using imaging guidance, second level 64494

This procedure involves injecting medication into the facet joints of your lower or sacral spine to manage pain. Imaging guidance ensures accurate placement. It's the second level, meaning it's done on two different joint levels.

75 services45 patients

Injection of anesthetic and/or steroid drug into sacral spine nerve root using imaging guidance, single level 64483

This procedure involves injecting a mix of numbing and anti-inflammatory medication into a specific nerve root in the lower back. It helps manage pain and reduce inflammation. The process is guided by imaging technology for precision.

62 services56 patients

Injection of anesthetic or steroid into joint between lower spine and hip bone using imaging guidance 27096

This procedure involves injecting medicine into the joint where your lower spine meets your hip bone. Using special imaging technology, the doctor ensures the medicine is delivered accurately. This can help reduce pain and inflammation in that area.

53 services34 patients

Destruction of lower or sacral spinal facet joint nerves using imaging guidance, single facet joint 64635

This procedure involves using imaging guidance to accurately target and destroy nerves in the lower or sacral spinal facet joint. It's done to relieve chronic back pain. The process is safe and usually effective.

44 services44 patients

Destruction of lower or sacral spinal facet joint nerves using imaging guidance, each additional facet joint 64636

This procedure involves using imaging technology to locate and treat nerves in your lower spine or sacral area that may be causing pain. Each additional facet joint refers to treating more than one spinal nerve. It's a non-invasive way to manage chronic back pain.

43 services43 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

36 services31 patients

Fluoroscopic guidance for needle placement 77002

Fluoroscopic guidance for needle placement is a medical procedure that uses a special X-ray technology to help accurately place a needle in the body. It's often used in biopsies, injections or other treatments to ensure precision and safety.

35 services30 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

35 services35 patients

Injection of upper or middle spine facet joint using imaging guidance, single level 64490

This procedure involves injecting medication into a joint in your upper or middle spine. It's performed under imaging guidance for precision. The aim is to reduce inflammation and pain. It's a single-level process, meaning one joint is treated at a time.

24 services15 patients

Injection of upper or middle spine facet joint using imaging guidance, second level 64491

This procedure involves injecting medication into the upper or middle spine facet joint, a small joint in your back. This is done under imaging guidance for precision. It's a second-level procedure, meaning it's done on two separate joints. It can help reduce pain and inflammation.

19 services12 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

18 services17 patients

Injection of trigger points, 3 or more muscles 20553

Trigger point injection therapy involves injecting medication into specific areas of your muscles, known as trigger points. These are areas that produce pain and discomfort. If you have three or more muscles affected, each will be treated individually.

15 services13 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

90.92/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

63.35

Promoting Interoperability

100

Improvement Activities

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.

KENNETH D. WHEELER CRNA

Nurse Anesthetist, Certified Registered

4150 V ST, PSSB-SUITE 1200, MED: ANESTHESIA
SACRAMENTO, CA 95817

Sacramento County (916) 734-7985

DR. MICHAEL JOHN THORNTON MD

Internal Medicine (Critical Care Medicine)

4150 V ST, SUITE 3400
SACRAMENTO, CA 95817

Sacramento County (916) 734-3566

THOMAS M. GOODNOW CRNA

Nurse Anesthetist, Certified Registered

4150 V ST, PSSB-SUITE 1200, MED: ANESTHESIA
SACRAMENTO, CA 95817

Sacramento County (916) 734-7985

DR. POURIA KASHKOULI M.D.

Internal Medicine

4150 V ST, #3116
SACRAMENTO, CA 95817

Sacramento County (916) 734-7080

DR. ALISON SEMRAD D.O.

Internal Medicine (Endocrinology, Diabetes & Metabolism)

4150 V ST, #3116
SACRAMENTO, CA 95817

Sacramento County (916) 734-7080

DR. DIANE HADDOCK M.D.

Internal Medicine

4150 V ST, #3116
SACRAMENTO, CA 95817

Sacramento County (916) 734-7080

JOHN S MILLAR M.D.

Internal Medicine (Critical Care Medicine)

4150 V ST, SUITE 3400
SACRAMENTO, CA 95817

Sacramento County (916) 734-3564

UC DAVIS

General Acute Care Hospital

4150 V ST, 2100
SACRAMENTO, CA 95817

Sacramento County (916) 734-8583

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 Gagan Mahajan's NPI number?

The NPI number for Gagan Mahajan is 1144205063. It was assigned to this individual provider in the NPPES registry on December 13, 2005.

Where is Gagan Mahajan located?

Gagan Mahajan practices at 4150 V St Pssb-Suite 1200 - Med: Anesthesia, Sacramento, CA 95817. The listed phone number is (916) 734-7985.

What is Gagan Mahajan's specialty?

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

Is Gagan Mahajan enrolled in Medicare?

Yes. Gagan Mahajan 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 Gagan Mahajan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gagan Mahajan reassigns Medicare benefits to 2 organizations: Regents Of The University Of Ca (Sacramento, CA) and Regents Of The University Of California (Sacramento, 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 Gagan Mahajan'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 Gagan Mahajan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.