MARGARET L CHEN (MD) – Internal Medicine Physician, NPI 1578678272
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
690 HOSPITALIST in MN
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Provider Addresses for MARGARET L CHEN (MD)
400 E THIRD ST MSS 6AV-1
DULUTH, MN 558051951
Phone: (187) 868-3192
Type: Mailing
400, East 3rd Street, Duluth, Saint Louis County, Minnesota, 55805, United States
DULUTH, MN 558051951
Phone: (218) 786-8364
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2020-04-22
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20170705002254 | I | Hospitalist | MN | TBD |
| I20200422001836 | I | Internal Medicine | WI | 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 | 600 | 160 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 153 | 60 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 113 | 113 | $0 |
| 99291 | Critical care, first 30-74 minutes | 77 | 28 | $0 |
| G0316 | Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th | 60 | 29 | $0 |
Insurance plans in this area (ZIP 55805)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physical Therapist In Private Practice | MT | |
| - | ND | |
| Physician Assistant | MN | |
| Nurse Practitioner | SD | |
| - | MN | |
| Qualified Audiologist | MN | |
| - | MN | |
| - | MN | |
| P A T H O L O G Y | WV | |
| Family Practice | MN |
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