YENJEAN HWANG (M.D.) – Infectious Disease Physician, NPI 1194744557
Infectious Disease Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,003 INFECTIOUS DISEASE in CA
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Provider Addresses for YENJEAN HWANG (M.D.)
PO BOX 255348
SACRAMENTO, CA 958655348
Phone: (916) 854-6975
Fax: (916) 854-6864
Type: Mailing
3100, Summit Street, Pill Hill, Oakland, Alameda County, California, 94609, United States
2ND FLOOR
OAKLAND, CA 946090000
Phone: (510) 869-8400
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 48 Open Payments records for all available years, with a total value of $3,334.
Total Amount is formed as General ($3,334) + Research ($0) + Ownership ($0) = $3,334.
Last reported payment date: 2024-12-12 • Largest payer in this snapshot: Microsurgical Technology, Inc. ($2,051).
Total Amount
$3,334
General + Research + Ownership
Payments
48
Total payment records
General Amount
$3,334
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-12
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Microsurgical Technology, Inc. | $2,051 |
| Insmed, Inc. | $374 |
| Horizon Therapeutics plc | $121 |
| GlaxoSmithKline, LLC. | $116 |
| CSL Behring | $115 |
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: 2005-10-04
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 |
|---|---|---|---|---|
| I20051004001014 | I | Infectious Disease | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 523 | 138 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 329 | 130 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 136 | 131 | $0 |
| 96372 | Injection of drug or substance under skin or into muscle | 49 | 11 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 29 | 20 | $0 |
Insurance plans in this area (ZIP 95865)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| INFECTIOUS DISEASE | CA | 90670 | Pneumococcal vaccine for injection into muscle | 18 | 18 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine | CA |
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