MICHAEL HUNG NGUYEN (DO) – Hospitalist Physician, NPI 1366939043
Hospitalist Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
3,302 HOSPITALIST in CA
Provider Addresses for MICHAEL HUNG NGUYEN (DO)
4445 MAGNOLIA AVE
RIVERSIDE, CA 925014135
Phone: (951) 788-3000
Type: Location
742, West Lamark Drive, Anaheim, Orange County, California, 92802, United States
ANAHEIM, CA 928024012
Phone: (714) 336-1850
Type: Mailing
Corpus Christi Medical Center - Bay Area, 7101, South Padre Island Drive, Corpus Christi, Nueces County, Texas, 78412, United States
CORPUS CHRISTI, TX 784124913
Phone: (361) 761-1000
Type: Location
12223 HIGHLAND AVE STE 106-526
RANCHO CUCAMONGA, CA 917392574
Phone: (714) 676-3880
Fax: (909) 946-5221
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $128.
Total Amount is formed as General ($128) + Research ($0) + Ownership ($0) = $128.
Last reported payment date: 2024-09-23 • Largest payer in this snapshot: ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) ($99).
Total Amount
$128
General + Research + Ownership
Payments
2
Total payment records
General Amount
$128
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-09-23
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2021-10-20
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 |
|---|---|---|---|---|
| I20211020003131 | I | Hospitalist | 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 |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 199 | 77 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 73 | 68 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 73 | 70 | $0 |
| 99291 | Critical care, first 30-74 minutes | 55 | 18 | $0 |
Insurance plans in this area (ZIP 92501)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine | CA | |
| Internal Medicine | CA | |
| Internal Medicine | CA | |
| Nurse Practitioner | CA | |
| Internal Medicine, Family Practice | CA | |
| H O S P I T A L I S T | CA | |
| Family Practice | CA | |
| Family Practice | CA | |
| Internal Medicine | TX | |
| Internal Medicine | CA |
Reviews
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