STEVEN YOUNG KO (MD) – Internal Medicine Physician, NPI 1194135780
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,779 PULMONARY DISEASE in CA
Provider Addresses for STEVEN YOUNG KO (MD)
17234 VALLEY BLVD
FONTANA, CA 92335
Phone: (909) 427-2608
Fax: (909) 427-5312
Type: Mailing
9961 SIERRA AVE
FONTANA, CA 923356720
Phone: (909) 427-2608
Fax: (909) 427-5312
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 7 Open Payments records for all available years, with a total value of $211.
Total Amount is formed as General ($211) + Research ($0) + Ownership ($0) = $211.
Last reported payment date: 2024-08-09 • Largest payer in this snapshot: Lilly USA, LLC ($130).
Total Amount
$211
General + Research + Ownership
Payments
7
Total payment records
General Amount
$211
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-09
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Lilly USA, LLC | $130 |
| Stryker Corporation | $66 |
| Regeneron Healthcare Solutions, Inc. | $16 |
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: 2018-05-03
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 |
|---|---|---|---|---|
| I20180503001642 | I | Pulmonary 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 |
|---|---|---|---|---|
| 99291 | Critical care, first 30-74 minutes | 81 | 53 | $0 |
Insurance plans in this area (ZIP 92335)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Critical Care (Intensivists), Pulmonary Disease, Pulmonary Disease, Critical Care (Intensivists) | FL | |
| Critical Care (Intensivists), Allergy/Immunology, Internal Medicine, Pulmonary Disease | CA | |
| Internal Medicine, Critical Care (Intensivists) | CA | |
| Internal Medicine, Pulmonary Disease, Pulmonary Disease, Critical Care (Intensivists), Critical Care (Intensivists), Internal Medicine, Pulmonary Disease | TX | |
| Internal Medicine, Critical Care (Intensivists) | CA | |
| Critical Care (Intensivists), Internal Medicine | WA | |
| Emergency Medicine, Critical Care (Intensivists) | CA | |
| Critical Care (Intensivists), Internal Medicine, Pulmonary Disease | MD | |
| Emergency Medicine, Critical Care (Intensivists) | CA | |
| Critical Care (Intensivists), Emergency Medicine | CA |
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