Dr. Gregory J. Porter, MD
- Medicare services, 2024
- 4,107
- Medicare patients, 2024
- 1,282
- Part D claims, 2024
- 618
- MIPS score, 2024
- 87
- Hospital affiliations
- 3
- Practice address
- 400 Sierra College Drive Suite B, Grass Valley, CA 95945
- Practice phone
- Call (530) 272-3411
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Sierra Ambulatory Surgery Center - Grass Valley
Surgery Center - Medicare-Certified · Grass Valley, California
Find Dr. Porter's professional email, personal email and mobile number
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Dr. Gregory J. Porter is an anesthesiologist in Grass Valley, California
Dr. Porter practices at Sierra Ambulatory Surgery Center - Grass Valley in Grass Valley, California.
Dr. Porter's NPI, 1790741262, was assigned on April 25, 2006. Dr. Porter graduated from Renaissance School of Medicine at Stony Brook University in 1990. Dr. Porter holds California license G72310.
- NPI
- 1790741262NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507858966
- NPI enumeration date
- April 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (530) 272-3411
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory J. Porter practices at Sierra Ambulatory Surgery Center - Grass Valley in Grass Valley, California
Dr. Porter's primary practice is Sierra Ambulatory Surgery Center - Grass Valley, at 400 Sierra College Drive Suite B, Grass Valley, CA 95945. The practice phone is (530) 272-3411.
- Sierra Ambulatory Surgery Center - Grass Valley400 Sierra College Drive Suite B, Grass Valley, CA 95945Phone(530) 272-3411
Source: Dmand AI Affiliation Data
Dr. Gregory J. Porter is affiliated with 5 sites of care and 2 medical groups
Dr. Porter's primary practice is Sierra Ambulatory Surgery Center - Grass Valley in Grass Valley, California. Dr. Porter is also affiliated with Enloe Health. The medical group on file is Interventional Pain Solutions. Dmand AI also links Dr. Porter to 2 more hospitals, 1 physician office and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory J. Porter's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Porter practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sierra Ambulatory Surgery Center - Grass Valley | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory J. Porter is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Porter's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Porter is board certified in anesthesiology by the American Board of Anesthesiology. Dr. Porter is licensed in California.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
Clinical focus
Dmand AI lists back pain injection and spinal stenosis among the conditions Dr. Porter treats.
Anesthesiologists near Dr. Porter
Counts of anesthesiologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory J. Porter billed Medicare for 4,107 services in 2024
CMS data shows 4,107 Medicare services from Dr. Porter across 23 procedure codes in 2024, for 1,282 Medicare patients. Medicare paid $328,812 for them.
Dr. Porter's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,1602024: 1,74851%
- Tests and treatments
- 2023: 752024: 1,0791339%
- Anesthesia
- 2023: 6602024: 660No change
- Other services
- 2023: 252024: 3611344%
- Surgery
- 2023: 3002024: 25914%
Where Dr. Porter's Medicare services took place, 2024
- In an office3,18878%
- In a facility91922%
Dr. Porter compared with the California median for anesthesiologists, 2024
- Dr. Porter
- California median
- Medicare services
- 4,107vs 7257.0 times
- Medicare patients
- 1,282vs 1439.0 times
- Part D claims
- 514vs 2322.3 times
Medians across 5,562 anesthesiologists in California with Dmand AI profiles that report each measure.
Dr. Porter's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Porter?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Porter and other anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory J. Porter treated 1,282 Medicare patients in 2024, average age 74
CMS counts 1,282 Medicare patients who saw Dr. Porter in 2024. The largest group is 75 to 84, with 513 patients. 75% of them have high cholesterol, and 69% have high blood pressure. 23% are also on Medicaid. Their average risk score is 1.12, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Porter's median patient age at 69, with 56% women.
Dr. Porter's Medicare patients by age, 2024
Dr. Porter's Medicare patients by sex, 2024
- Women79262%
- Men49038%
Chronic conditions among Dr. Porter's Medicare patients, 2024
- High cholesterol75%
- High blood pressure69%
- Arthritis63%
- Anxiety31%
- Mood disorders31%
- Depression29%
- Ischemic heart disease22%
- Diabetes21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Porter's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory J. Porter wrote 618 Medicare Part D claims in 2024
In 2024, Dr. Porter wrote 618 Medicare Part D claims for 130 patients. 94% of them were for generic drugs. CMS names the drug for 514 of them, across 14 drugs with 11 or more claims each, at $16,503 in total drug cost.
Dr. Porter's Part D claims by kind of drug, 2024
- Generic578 claims94%
- Brand-name40 claims6%
Dr. Porter's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Porter's Part D claims, 2024
- Opioids63%389 of 618 claims
- Antibiotics2%14 of 618 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Gregory J. Porter scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Porter for performance year 2024, reported as part of a group. Dr. Porter accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Porter as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Porter's MIPS scores, performance year 2024
- 87of 100Final score
- 95of 100Quality
- 40of 100Improvement Activities
- 40of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gregory J. Porter received $2,940 in industry payments from 2016 to 2025
CMS Open Payments shows 73 general payments to Dr. Porter from 11 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 67% of the total. Abbott Laboratories paid the most, $1,202.
General payments to Dr. Porter by program year, 2016 to 2025
General payments to Dr. Porter by kind, 2016 to 2025
- Food and beverage$1,95567%
- Travel and lodging$98433%
Companies that paid Dr. Porter the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory J. Porter graduated from Renaissance School of Medicine at Stony Brook University
Dr. Porter graduated from Renaissance School of Medicine at Stony Brook University in 1990.
- Medical school
- Board certified in anesthesiology
Source: Dmand AI Professional Profile Data
Dr. Gregory J. Porter accepts plans from 3 insurance carriers
Dr. Porter is in network with 3 carriers, including Aetna, Elevance and CMS Medicare. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Aetna
- Elevance
- CMS Medicare
Plan types Dr. Porter accepts, by number of carriers
- EPO2
- Medicare2
- PPO2
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory J. Porter's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory J. Porter
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What is Dr. Gregory J. Porter's NPI number?
Dr. Gregory J. Porter's NPI number is 1790741262. It was assigned on April 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory J. Porter?
Dr. Gregory J. Porter is an anesthesiologist in Grass Valley, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Gregory J. Porter practice?
Dr. Porter practices at 400 Sierra College Drive Suite B, Grass Valley, CA 95945. Dr. Porter's primary practice is Sierra Ambulatory Surgery Center - Grass Valley in Grass Valley, California. Dmand AI also links Dr. Porter to 2 hospitals, 1 physician office and 1 medical group.
What is Dr. Gregory J. Porter's office phone number?
The practice phone on file for Dr. Porter is (530) 272-3411.
What is Dr. Gregory J. Porter's medical license number?
Dr. Porter holds California license G72310.
Which hospitals is Dr. Gregory J. Porter affiliated with?
Dr. Porter is affiliated with Enloe Health. Dmand AI links Dr. Porter to 2 more hospitals.
What medical group is Dr. Gregory J. Porter part of?
Dr. Porter is linked to Interventional Pain Solutions. Dmand AI links Dr. Porter to 1 more medical group.
Does Dr. Gregory J. Porter accept Medicare?
Yes. CMS data shows Dr. Porter billed Medicare for 4,107 services in 2024, and Dr. Porter accepts Medicare assignment.
Does Dr. Gregory J. Porter offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Porter as offering telehealth services.
What is Dr. Gregory J. Porter's MIPS score?
Dr. Porter's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Gregory J. Porter see?
CMS counts 1,282 Medicare patients who saw Dr. Porter in 2024, with an average age of 74.
Is Dr. Gregory J. Porter board certified?
Yes. Dr. Porter is board certified in anesthesiology by the American Board of Anesthesiology.
What services does Dr. Gregory J. Porter bill to Medicare?
In 2024, Dr. Porter's most billed Medicare services were care management and other visits (99443), anesthesia (00142) and office visit, established patient (99214).
Where did Dr. Gregory J. Porter go to medical school?
Dr. Porter graduated from Renaissance School of Medicine at Stony Brook University in 1990.
What drugs does Dr. Gregory J. Porter prescribe most?
In 2024 Medicare Part D data, Dr. Porter's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Oxycodone-Acetaminophen and Gabapentin.
Has Dr. Gregory J. Porter received payments from drug or device companies?
CMS Open Payments shows $2,940 in general payments to Dr. Porter from 11 companies from 2016 to 2025. The largest total came from Abbott Laboratories.
How long has Dr. Gregory J. Porter been practicing?
Dr. Porter graduated from medical school in 1990, 36 years ago.
What insurance does Dr. Gregory J. Porter accept?
Dr. Porter is in network with 3 carriers, including Aetna, Elevance and CMS Medicare. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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