MARK STEPHEN SINGER (M.D.) – Internal Medicine Physician, NPI 1962486332
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
21,508 INTERNAL MEDICINE in CA
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Provider Addresses for MARK STEPHEN SINGER (M.D.)
3334, Sterling Court, Napa, Napa County, California, 94558, United States
NAPA, CA 945584262
Phone: (707) 365-5151
Fax: (707) 252-4887
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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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: 2004-09-20
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 |
|---|---|---|---|---|
| I20040920001187 | I | Internal Medicine | 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 |
|---|---|---|---|---|
| 99349 | Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes | 436 | 62 | $0 |
| 99308 | Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes | 247 | 67 | $0 |
| 99306 | Initial nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | 121 | 115 | $0 |
| 99309 | Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | 58 | 34 | $0 |
| 99497 | Advance care planning, first 30 minutes | 41 | 39 | $0 |
Insurance plans in this area (ZIP 94558)
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