NANCY C LASSON (D.O.) – Internal Medicine Physician, NPI 1679572390
Internal Medicine Physician
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Profile Insights
NPPES metrics only — not quality of care.
1,158 INTERNAL MEDICINE in RI
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Provider Addresses for NANCY C LASSON (D.O.)
West River Street, Providence, Providence County, Rhode Island, 02918, United States
PROVIDENCE, RI 029042609
Phone: (401) 793-5700
Fax: (401) 793-7801
Type: Location
455 TOLL GATE RD
PRC AND CREDENTIALING
WARWICK, RI 028862759
Phone: (401) 273-0641
Fax: (401) 273-2919
Type: Mailing
1195 NORTH MAIN STREET
CNEMG PRIMARY CARE WMC
PROVIDENCE, RI 029040288
Phone: (401) 736-4562
Fax: (401) 921-9864
Type: Location
101, Ellenfield Street, Providence, Providence County, Rhode Island, 02905, United States
PROVIDENCE, RI 029054541
Phone: (401) 444-6779
Fax: (401) 444-6912
Type: Mailing
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: 2017-08-24
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 |
|---|---|---|---|---|
| I20080929000196 | I | Internal Medicine | DE | TBD |
| I20170824000832 | I | Internal Medicine | RI | 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 | 83 | 66 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 69 | 38 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 27 | 27 | $0 |
Insurance plans in this area (ZIP 02904)
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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 | RI | |
| Internal Medicine | RI | |
| Physician Assistant | RI | |
| A N E S T H E S I O L O G Y | RI | |
| A N E S T H E S I O L O G Y | RI | |
| Cardiovascular Disease (Cardiology), Interventional Cardiology, Interventional Cardiology, Cardiovascular Disease (Cardiology) | RI | |
| Cardiovascular Disease (Cardiology) | MA | |
| Internal Medicine, Pulmonary Disease, Pulmonary Disease | MA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | NY | |
| - | RI |
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