DR. GREGORY J PORTER M.D.
Prescription History 1790741262
Anesthesiology in Grass Valley, CA
What does Dr. Porter prescribe?
In 2024, Dr. Porter wrote 514 Medicare prescriptions for 14 medications. The most prescribed was Hydrocodone-Acetaminophen (hydrocodone/acetaminophen), with 204 prescriptions for 58 patients.
Medicare Part D only. These are prescriptions filled by people with Medicare drug coverage in 2024, from the CMS data released in 2026, the most recent year available. CMS does not publish medications with fewer than 11 prescriptions, so this is not a full list of what Dr. Porter prescribes.
Medications 14 medications
Prescriptions filled under Medicare Part D in 2024. Select a medication to see what it is used for and how it compares with other California prescribers.
What it is used for
This combination medication is used to relieve moderate to severe pain.
Compared with California prescribers
Dr. Porter wrote 204 prescriptions for Hydrocodone-Acetaminophen, about 2.7 times as often as the typical California prescriber of it (76). Medicare paid $22.70 per fill, versus $21.39 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This combination medication is used to help relieve moderate to severe pain.
Compared with California prescribers
Dr. Porter wrote 57 prescriptions for Oxycodone-Acetaminophen, about as often as the typical California prescriber of it (50). Medicare paid $20.96 per fill, versus $29.84 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Gabapentin is used with other medications to prevent and control seizures.
Compared with California prescribers
Dr. Porter wrote 51 prescriptions for Gabapentin, about 64% as often as the typical California prescriber of it (80). Medicare paid $17.33 per fill, versus $15.63 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
See also Warning section.
Compared with California prescribers
Dr. Porter wrote 36 prescriptions for Tramadol Hcl, about 82% as often as the typical California prescriber of it (44). Medicare paid $6.03 per fill, versus $6.24 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Buprenorphine is used to treat opioid use disorder.
Compared with California prescribers
Dr. Porter wrote 24 prescriptions for Buprenorphine Hcl, about 68% as often as the typical California prescriber of it (36). Medicare paid $44.84 per fill, versus $39.54 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to help relieve severe ongoing pain (such as due to arthritis, chronic back pain).
Compared with California prescribers
Dr. Porter wrote 23 prescriptions for Buprenorphine, about 61% as often as the typical California prescriber of it (38). Medicare paid $237.96 per fill, versus $238.41 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Cyclobenzaprine is used short-term to treat muscle spasms.
Compared with California prescribers
Dr. Porter wrote 22 prescriptions for Cyclobenzaprine Hcl, about 68% as often as the typical California prescriber of it (32). Medicare paid $3.09 per fill, versus $8.89 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat pain caused by nerve damage due to diabetes, shingles (herpes zoster) infection, or spinal cord injury.
Compared with California prescribers
Dr. Porter wrote 21 prescriptions for Pregabalin, about half as often as the typical California prescriber of it (39). Medicare paid $24.97 per fill, versus $24.98 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
See also Warning section.
Compared with California prescribers
Dr. Porter wrote 15 prescriptions for Acetaminophen-Codeine, about half as often as the typical California prescriber of it (29). Medicare paid $24.53 per fill, versus $17.48 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This product is used to help reduce itching and pain from certain skin conditions (such as scrapes, minor skin irritations, insect bites).
Compared with California prescribers
Dr. Porter wrote 13 prescriptions for Lidocaine, about 35% as often as the typical California prescriber of it (38). Medicare paid $85.54 per fill, versus $98.50 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to help relieve moderate to severe pain.
Compared with California prescribers
Dr. Porter wrote 13 prescriptions for Oxycodone Hcl, about 30% as often as the typical California prescriber of it (43). Medicare paid $31.07 per fill, versus $16.05 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Porter wrote 12 prescriptions for Cephalexin, about 40% as often as the typical California prescriber of it (30). Medicare paid $7.56 per fill, versus $7.62 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to help relieve severe ongoing pain (such as due to cancer).
Compared with California prescribers
Dr. Porter wrote 12 prescriptions for Morphine Sulfate Er, about 31% as often as the typical California prescriber of it (39). Medicare paid $20.13 per fill, versus $33.95 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Baclofen is used to treat muscle spasms caused by certain conditions (such as multiple sclerosis, spinal cord injury/disease).
Compared with California prescribers
Dr. Porter wrote 11 prescriptions for Baclofen, about 26% as often as the typical California prescriber of it (42). Medicare paid $19.90 per fill, versus $14.75 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
Questions about Dr. Porter’s prescriptions
What does Dr. Porter prescribe most?
In 2024 Medicare Part D data, Dr. Porter's most prescribed medications were Hydrocodone-Acetaminophen (204), Oxycodone-Acetaminophen (57) and Gabapentin (51).
How does Dr. Porter's prescribing compare with other California prescribers?
Of the 14 medications with a state comparison, Dr. Porter prescribes 1 more often than the typical California prescriber, 2 about as often and 11 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Porter prescribes?
No. It covers prescriptions filled by people with Medicare Part D drug coverage in 2024, and CMS leaves out any medication with fewer than 11 prescriptions.
About this data
This page shows one provider’s slice of public Medicare files. NPI Profile does not receive prescriptions or patient records.
| Source | What it provides here | Data year |
|---|---|---|
| CMS Medicare Part D Prescribers by Provider and Drug | Each medication, prescriptions, patients, 30-day fills, days of medication and cost. State comparisons average the California prescribers of the same medication and form, where at least five wrote it. | 2024 (released 2026, the most recent available) |
| CMS Medicare Part D Drug Spending Dashboard | What each medication is used for. | 2024 |
- Only prescriptions filled by people with Medicare Part D drug coverage are counted. Private insurance, Medicaid and cash purchases are not.
- CMS leaves out medications with fewer than 11 prescriptions and hides patient counts under 11.
- Cost per fill is what the plan and the patient paid the pharmacy together, not what you pay at the counter.
- Medication descriptions are summaries from CMS. They are not medical advice; ask a health care professional about any medication.
