Dr. Mark Arthur Peterson , MD
Surgery • Greenbrae, CA
1300 S Eliseo Dr, Ste 104
Greenbrae, CA 949042023
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on June 9, 2006; this date does not establish years in practice.
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Published CMS data list 43 Medicare Part D prescriptions, including refills, in 2019.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2019. Published rows only; this is not a quality measure.
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Published Part D records, 2019:
- Levothyroxine Sodium — 17 prescription fills, including refills.
- Gabapentin — 15 prescription fills, including refills.
- Doxazosin Mesylate — 11 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2019. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 582 in 2014 to 43 in 2019.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2014–2019.
Practice Location & Contact Primary Location
1300 S Eliseo Dr
Ste 104
Greenbrae, CA 949042023
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
93 standardized 30-day fills in 2019
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$902 in 2019
The total cost of these prescriptions in 2019, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2019.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Greenbrae and California
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Peterson are from 2019.
4 active clinicians are listed under Surgery with a practice address in Greenbrae, CA (3,120 in California).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 93% from 582 in 2014 to 43 in 2019.
- 2014: 582
- 2015: 292
- 2019: 43
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30-day fills
30-day fills decreased 84% from 593 in 2014 to 93 in 2019.
- 2014: 593
- 2015: 293
- 2019: 93
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Part D drug cost
Part D drug cost decreased 96% from $25,168 in 2014 to $902 in 2019.
- 2014: $25,168
- 2015: $15,545
- 2019: $902
Sources: CMS Medicare Part D Prescribers (2019), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2019.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Levothyroxine Sodium | Levothyroxine Sodium | 17 | 1,339 | $464.77 | 13 |
| Gabapentin | Gabapentin | 15 | 690 | $248.58 | — |
| Doxazosin Mesylate | Doxazosin Mesylate | 11 | 736 | $188.22 | — |
Source: CMS Part D by Provider and Drug, 2019; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Colon & Rectal Surgery
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine - Nephrology
Doctor of Medicine (M.D.)
Specialist
Doctor of Medicine (M.D.)
Dermatology
Doctor of Medicine (M.D.)
Dermatology - Procedural Dermatology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated June 09, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Mailing Address
438 Riviera Cir
Larkspur, CA 949391510
Phone: 4154617955