Stephanie Maroney, M.D.
Stephanie Maroney, M.D. is a Surgery Physician in Larkspur, CA, registered under NPI 1003106436.
Getting there
Here is what surrounds this office in Larkspur, based on OpenStreetMap data collected Sep 5, 2026. Parking is available about 0.31 mi away. The nearest transit stop is 222 ft away, served by Bon Air Road & Magnolia Avenue.
Getting here and what is nearby
Transit Magnolia Avenue & Bon Air Road 124 ft ~1 min
Transit Magnolia Avenue & Bon Air Road 154 ft ~1 min
Transit Bon Air Road & Magnolia Avenue 222 ft ~1 min
Parking 932 ft ~4 min
Parking 0.28 mi ~6 min
Parking 0.31 mi ~7 min
Restaurant M&G Burgers 0.34 mi ~7 min
Restaurant R'Noh Thai 0.41 mi ~9 min
1000B Magnolia Avenue, 94939
Gas station Larkspur Gas 0.49 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A122712 | CA | Surgery Physician primary |
| 281722 | MA | Surgery Physician |
Licences are recorded in 2 states: CA, MA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - General Surgery
- PAC ID
- 1759671886
- Enrollment ID
- I20160602000710
Medicare enrolment is recorded as approved under the provider type Practitioner - General Surgery. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: California and Massachusetts. The practice address on file is in Larkspur, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Surgery covers
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. NUCC Health Care Provider Taxonomy, code 208600000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 208600000X | Surgery Physician | A122712 | CA | primary |
| 208600000X | Surgery Physician | 281722 | MA |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003106436 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 19, 2011 |
| Last updated | Mar 4, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | M.D. |
| Practice address |
5 BON AIR RD STE 101 Larkspur, CA 94939 (415) 924-2515 Fax (415) 924-2661 |
| Other names |
Stephanie Humber Former Legal Business Name |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 1 | 0 | 6 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 0 | 3 | 4 | 6 |
Sum = 44 · next multiple of 10 = 50 · check digit = 6 · actual last digit = 6
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.