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Gregory J Bellig, MD

Anesthesiology · Fremont

NPI 1558354993

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
3
1 carrier
Offices
3
Since medical school
28 years
Georgetown University School of Medicine, 1998

Offices

3 locations · Cep America - Anesthesia PC · Premier Anesthesia of California PC

Looking this up.

Hospitals listed: John Muir Medical Center - Walnut Creek Campus. That is not proof they admit you there this week.

Plans that list them

3 plans · 1 carrier

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Bellig’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

Plans whose provider directory lists this clinician
Imperial Courage Plan (HMO)Imperial Health Plan of California, Inc.ListedSep 1, 2026
Imperial Dynamic Plan (HMO)Imperial Health Plan of California, Inc.ListedSep 1, 2026
Imperial Senior Value (HMO C-SNP)Imperial Health Plan of California, Inc.ListedSep 1, 2026

California Medical Board record

Licence A81822 · Current

Licensed to practise in California · since 2003 · expires 2029-01-31 · Georgetown University School of Medicine.

No disciplinary actions, convictions, malpractice judgments or citations in this record.

School, training and certification

What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.

Specialty certification

  • American Board of Anesthesiology - Anesthesiology
  • American Board of Anesthesiology - Pediatric Anesthesiology

Hospitals they work in

1 hospital

These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.

  • John Muir Medical Center - Walnut Creek CampusWalnut Creek, CAAcute Care Hospital · Voluntary non-profit - Other · Has an emergency department · Birthing-friendlyPart of John Muir Health, which runs 3 hospitalsPatients rate it 3 of 5 · 77% would definitely recommend it
    Overall rating: 2 of 5 starsWorse than the national rate — Abdominopelvic accidental puncture or laceration rate: 2.01 (1.17 to 2.85) · 2,206 cases, Jul 2022 – Jun 2024Worse than the national rate — Death rate among surgical inpatients with serious treatable complications: 222.42 (177.82 to 267.02) · 120 cases, Jul 2022 – Jun 2024Worse than the national rate — Pressure ulcer rate: 1.4 (0.91 to 1.9) · 9,764 cases, Jul 2022 – Jun 2024Worse than the national rate — SSI - Colon Surgery: 2.734, Oct 2024 – Sep 2025Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.536, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.341, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.455, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.245, Oct 2024 – Sep 2025
See every measure and the patient survey for John Muir Medical Center - Walnut Creek Campus

Behind the star rating — Deaths: 3 better, 2 the same, 2 worse of 7 measures. Safety: 2 better, 5 the same, 1 worse of 8 measures. Readmissions: 3 better, 5 the same, 2 worse of 10 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.

Every scored measure at John Muir Medical Center - Walnut Creek Campus
Abdominopelvic accidental puncture or laceration rateComplications and deaths2.01 (1.17 to 2.85) · 2,206 casesWorseJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths222.42 (177.82 to 267.02) · 120 casesWorseJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths1.4 (0.91 to 1.9) · 9,764 casesWorseJul 2022 – Jun 2024
SSI - Colon SurgeryInfections2.734WorseOct 2024 – Sep 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.536BetterOct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.341BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.455BetterOct 2024 – Sep 2025
MRSA BacteremiaInfections0.245BetterOct 2024 – Sep 2025
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths1.14 (0.87 to 1.4)No differentJul 2022 – Jun 2024
Death rate for COPD patientsComplications and deaths6.4 · 131 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths10 · 148 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths9.8 · 695 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths12.5 · 827 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths14.1 · 509 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths3.4 · 4,483 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.35 (0.18 to 0.53) · 11,630 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.22 (0.05 to 0.39) · 11,793 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths3.33 (1.69 to 4.96) · 3,268 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths1.37 (0 to 2.94) · 1,631 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.76 (1.43 to 4.09) · 3,066 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths6.12 (0.22 to 12.02) · 1,580 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths4.43 (1.21 to 7.64) · 1,594 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.82 (0.4 to 3.24) · 685 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths3.9 · 615 casesNoneApr 2023 – Mar 2025
SSI - Abdominal HysterectomyInfections1.88No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits14.7 · 93 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits19.9 · 729 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits-30.1 · 91 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-13 · 736 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits34.8 · 842 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.7 · 818 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.3 (3.3 to 8.4) · 28 casesNo differentJan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits10.8 (7.2 to 15.5) · 28 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits4.9 · 584 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits20.4 · 139 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits13.2 (9.9 to 17.9) · 222 casesNo differentJan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits1.1 (0.8 to 1.5) · 321 casesNo differentJan 2024 – Dec 2024

What patients said (758 patients answered, 24% of those asked)

Patient survey stars by topic at John Muir Medical Center - Walnut Creek Campus
Cleanliness3
Nurse communication3
Doctor communication3
Communication about medicines2
Discharge information4
Overall hospital rating3
Quietness3
Recommend hospital4
Share of patients giving the best answer at John Muir Medical Center - Walnut Creek Campus
Room was "always" clean65%
Nurses "always" communicated well75%
Doctors "always" communicated well76%
Staff "always" explained55%
Yes, staff "did" give patients this information87%
Yes, staff "did" give patients information about help after discharge87%
Doctors "always" explained things so they could understand70%
Doctors "always" listened carefully75%
Doctors "always" treated them with courtesy and respect82%
Patients who gave a rating of "9" or "10" (high)69%
Staff "always" explained new medications68%
Nurses "always" explained things so they could understand71%
Nurses "always" listened carefully72%
Nurses "always" treated them with courtesy and respect83%
"Always" quiet at night53%
"YES", patients would definitely recommend the hospital77%
Staff "always" explained possible side effects42%
Yes, staff "did" give patients information about possible symptoms87%

Original Medicare doctor bills

$16,112

Medicare paid this office $16,112 for 77 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

Procedures year by year

Procedures billed to Original Medicare by year
Procedure20202021202220232024
Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus)––16––
Insertion of artery tube for blood sampling or infusion through skin–13–––

Times billed to Original Medicare each year. A blank year means fewer than 11 people had it, or none: Medicare does not publish smaller counts. Medicare Advantage patients are not included.

Who their Medicare patients are

77 Original Medicare patients in 2024. Average age 76 · Women 52% · Also on Medicaid 23% · Health risk score 1.43. At or below the middle of the specialty; the typical anesthesiology clinician is at 1.54.

Conditions among them: High blood pressure 75% · Cancer 36% · Chronic kidney disease 35% · Coronary heart disease 32% · Diabetes 26% · Atrial fibrillation 23% · Depression 21% · Heart failure 19% · COPD 16% · Stroke 16%.

The office billed $198,966, Medicare allowed $20,256 and paid $16,112; for 87 services of 37 kinds.

Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.

Year by year

Original Medicare by year
20247787761.43$198,966$16,112
2023178194731.84$400,976$35,297
2022285350741.39$791,300$55,938
2021189234731.42$641,043$44,265
20202328711.64$66,170$4,921

Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.

See the services billed each year

2023: 3 services

Original Medicare services billed in 2023
Anesthesia for x-ray or radiation therapy16$3,284$205
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope19$2,630$138
Anesthesia for other procedure on large bowel using an endoscope18$2,061$115

2022: 8 services

Original Medicare services billed in 2022
Anesthesia for lens surgery65$7,820$120
Anesthesia for procedure for total knee joint replacement16$4,657$291
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope26$3,798$136
Anesthesia for other procedure on large bowel using an endoscope17$2,354$138
Anesthesia for procedure on small and large bowel using an endoscope13$1,970$152
Anesthesia for exam of colon using an endoscope12$1,402$117
Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus)16$892$56
Ultrasonic guidance for needle placement19$523$28

2021: 2 services

Original Medicare services billed in 2021
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope33$4,539$138
Insertion of artery tube for blood sampling or infusion through skin13$509$39

Drugs they prescribed that Part D paid

This is pharmacy cost, not the office bill, and not what patients paid.

Opioids were 0% of their 16 Part D prescriptions in 2019. Too few prescriptions to judge: with under about 50 a year, a handful of patients can swing this share.

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

Year by year

Part D prescribing by year
201916None0% (0)0%$214
201853None0% (0)None$2,492

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

Money from drug and device companies

$49 in 2021

A payment is not proof that care is biased.

Payments by company
Acacia PharmaBarhemsys$49
1 payment
  • Meals for Barhemsys · 2021-08-09 · $49
See the published payment
Every published payment
Acacia PharmaMeals · 2021-08-09Barhemsys$49

Checkups this office reported

Medicare did not publish checkup rates for this clinician.

Medicare’s overall office score
61.2 / 100
Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.

Professional record

NPI
1558354993
Licence
CA A81822, MI 4301113241, PA MD456369California A81822: Current · expires 2029-01-31
Trained
Georgetown University School of Medicine, 1998 · 28 years ago
Group
Cep America - Anesthesia PC · Premier Anesthesia of California PC
Gender
Male
More record details
Sole proprietor
No
Medicaid ID
CA GR0028370
Taxonomy
Federal specialty code 207L00000X (207L00000X)
Mailing address
567 Sycamore Valley Rd W, Danville, CA, 94526
NPI first listed
2005-08-30
NPI last updated
2026-09-20
NPI record certified
2026-09-20

This is when the NPI record was last certified, not a medical board exam.