DR. OLIVIA MASLON SIWOSKI (M.D.) – Internal Medicine Physician, NPI 1609260884
Internal Medicine Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
7,218 INTERNAL MEDICINE in MI
Provider Addresses for DR. OLIVIA MASLON SIWOSKI (M.D.)
601 JOHN STREET
BOX 39
KALAMAZOO, MI 49007
Phone:
Type: Mailing
601 JOHN ST
KALAMAZOO, MI 490075341
Phone: (269) 341-8481
Type: Location
965 S Bailey Ave Ste 101
South Haven, MI 490906743
Phone: (269) 639-2777
Type: Location
3901 RAINBOW BLVD
KANSAS CITY, KS 661608500
Phone: (913) 588-6050
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 14 Open Payments records for all available years, with a total value of $246.
Total Amount is formed as General ($246) + Research ($0) + Ownership ($0) = $246.
Last reported payment date: 2024-10-09 • Largest payer in this snapshot: Novartis Pharmaceuticals Corporation ($50).
Total Amount
$246
General + Research + Ownership
Payments
14
Total payment records
General Amount
$246
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-09
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: 2021-01-21
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 |
|---|---|---|---|---|
| I20210121002973 | I | Internal Medicine | MI | 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 | 223 | 89 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 110 | 56 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 62 | 62 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 29 | 29 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 19 | 19 | $0 |
Insurance plans in this area (ZIP 49007)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | MI | |
| Hand Surgery, Orthopedic Surgery | MI | |
| Physician Assistant | MI | |
| Physician Assistant | MI | |
| Cardiovascular Disease (Cardiology), Internal Medicine | MI | |
| Family Practice | MI | |
| O B S T E T R I C S/ G Y N E C O L O G Y | MI | |
| Endocrinology, Internal Medicine | MI | |
| Clinical Social Worker | MI | |
| Internal Medicine | MI |
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