DORIANN KLAASSEN (MD) – Internal Medicine Physician, NPI 1043721632
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
220 ENDOCRINOLOGY in MO
Provider Addresses for DORIANN KLAASSEN (MD)
1 BARNES JEWISH HOSPITAL PLZ
SAINT LOUIS, MO 631101003
Phone: (314) 362-5000
Type: Location
1030 FALMOUTH RD # 201
HYANNIS, MA 026012324
Phone: (774) 470-5080
Type: Mailing
660, South Euclid Avenue, Central West End, City of Saint Louis, Missouri, 63110, United States
JOHN T. MILLIKEN DEPARTMENT OF MEDICINE, CB 8066
ST. LOUIS, MO 63110
Phone: (314) 362-5000
Type: Mailing
4921 PARKVIEW PL
SAINT LOUIS, MO 631101032
Phone: (314) 362-3500
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 12 Open Payments records for all available years, with a total value of $387.
Total Amount is formed as General ($387) + Research ($0) + Ownership ($0) = $387.
Last reported payment date: 2024-12-12 • Largest payer in this snapshot: BETA BIONICS, INC. ($127).
Total Amount
$387
General + Research + Ownership
Payments
12
Total payment records
General Amount
$387
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 |
|---|---|
| BETA BIONICS, INC. | $127 |
| Amgen Inc. | $45 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $31 |
| Tandem Diabetes Care, Inc. | $31 |
| Dexcom, Inc. | $31 |
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: 2024-10-11
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 |
|---|---|---|---|---|
| I20241011003898 | I | Endocrinology | MA | 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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 63110)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| E N D O C R I N O L O G Y | MA | |
| Nurse Practitioner | MA | |
| Physician Assistant | MA | |
| Internal Medicine, Cardiovascular Disease (Cardiology) | MA | |
| Family Practice | MA | |
| Internal Medicine | MA | |
| Thoracic Surgery, General Surgery | MA | |
| - | MA | |
| N E U R O S U R G E R Y | MA | |
| - | NV |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.