DR. GREGORY J PORTER (M.D.) – Anesthesiology Physician, NPI 1790741262
Anesthesiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
6,371 ANESTHESIOLOGY in CA
Provider Addresses for DR. GREGORY J PORTER (M.D.)
605 W East Ave
Chico, CA 959267201
Phone: (530) 343-4757
Fax: (530) 343-3347
Type: Location
PO BOX 25033
SANTA ANA, CA 927995033
Phone: (800) 883-7243
Fax: (714) 347-1082
Type: Mailing
400 SIERRA COLLEGE DR STE B
GRASS VALLEY, CA 959455093
Phone: (530) 272-3428
Fax: (530) 272-3429
Type: Location
North Tustin Avenue, Santa Ana, Orange County, California, 92705, United States
SANTA ANA, CA 927053807
Phone: (800) 883-7243
Fax: (714) 647-1245
Type: Mailing
400, Sierra College Drive, Spring Hill, Grass Valley, Nevada County, California, 95945, United States
GRASS VALLEY, CA 959455089
Phone: (530) 272-3428
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 42 Open Payments records for all available years, with a total value of $1,016.
Total Amount is formed as General ($1,016) + Research ($0) + Ownership ($0) = $1,016.
Last reported payment date: 2024-12-30 • Largest payer in this snapshot: Abbott Laboratories ($817).
Total Amount
$1,016
General + Research + Ownership
Payments
42
Total payment records
General Amount
$1,016
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-30
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Abbott Laboratories | $817 |
| Nalu Medical, Inc. | $75 |
| Medtronic, Inc. | $56 |
| Glaukos Corporation | $30 |
| Curonix LLC | $23 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-04-02
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040402001156 | I | Anesthesiology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99443 | Telephone medical discussion with physician, 21-30 minutes | 678 | 672 | $0 |
| 00142 | Anesthesia for lens surgery | 582 | 402 | $0 |
| 99442 | Telephone medical discussion with physician, 11-20 minutes | 377 | 297 | $0 |
| 64493 | Injection of lower or sacral spine facet joint using imaging guidance, single level | 96 | 49 | $0 |
| 64494 | Injection of lower or sacral spine facet joint using imaging guidance, second level | 95 | 48 | $0 |
Insurance plans in this area (ZIP 95926)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| ANESTHESIOLOGY | CA | 64493 | Injections of lower or sacral spine facet joint using imaging guidance | 102 | 50 |
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