Physician Profile
Unclaimed ProfileAbout SINGER
Based in Napa, CA, Mark Stephen Singer, M.D. is listed in the NPI registry under internal medicine. Mark graduated from University of California, Geffen School of Medicine in 1983. Mark is also listed as specialising in emergency medicine.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Singer?
Dr. Singer is an internal medicine in Napa, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “INTERNAL MEDICINE”.
NPI registry
What is Dr. Singer's address?
Dr. Singer is listed at 3334 STERLING CT, Napa, CA 94558. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Singer?
The number on file is (707) 365-5151. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Singer's NPI number?
Dr. Singer's National Provider Identifier is 1962486332. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Singer train?
Dr. Singer attended University of California, Geffen School of Medicine, graduating in 1983. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Singer been practising?
Dr. Singer has 43 years experience. Calculated from a graduation year of 1983, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Singer perform?
According to Medicare billing data, Dr. Singer performs procedures including insertion of needle into vein; provides treatments such as influenza vaccine split virus, preservative free, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Singer confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Singer. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (707) 365-5151
- Email not available
Practice Locations
3334 STERLING CT
Napa, CA 94558
Procedures Most Often Billed to Medicare
1,103 services · 537 patients · 13 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Insertion of needle into vein (3 years or older) | Procedure | 36410 |
17 |
| Influenza vaccine split virus, preservative free | Treatment | 90662 |
15 |
| Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes | Office visit | 99349 |
462 |
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more | Office visit | 99308 |
176 |
| Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more | Office visit | 99306 |
119 |
| Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99309 |
88 |
| Advance care planning, first 30 minutes | Office visit | 99497 |
62 |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | Billing code | G0439 |
53 |
| Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | Office visit | 99310 |
42 |
| Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes | Office visit | 99350 |
20 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internal medicines in Napa 8
Same specialty, same city.
Trained at University of California, Geffen School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1983 at University of California, Geffen School of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Insertion of needle into vein (3 years or older) 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.