DR. MAN-SIAK MAK (MD) – Gastroenterology Physician, NPI 1609875004
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,981 GASTROENTEROLOGY in CA
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Provider Addresses for DR. MAN-SIAK MAK (MD)
G Street, Merced County, California, United States
MERCED, CA 95340
Phone: (209) 349-8459
Fax: (209) 580-4138
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: 2008-12-29
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 |
|---|---|---|---|---|
| I20081229000299 | I | Gastroenterology | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 204 | 126 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 137 | 81 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 74 | 74 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 35 | 33 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 29 | 29 | $0 |
Insurance plans in this area (ZIP 95340)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | CA | 45385 | Removal of polyps or growths of large bowel using an endoscope | 100 | 96 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | CA | |
| O T O L A R Y N G O L O G Y | CA | |
| Family Practice, Emergency Medicine | CA | |
| Obstetrics/Gynecology, Family Practice | CA | |
| Family Practice | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | CA |
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