MARY HOWLAND WILLIAMSON (MD) – Obstetrics & Gynecology Physician, NPI 1770102014
Obstetrics & Gynecology Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
2,146 OBSTETRICS/GYNECOLOGY in PA
Provider Addresses for MARY HOWLAND WILLIAMSON (MD)
116 HAWK CT
HUMMELSTOWN, PA 170368862
Phone: (831) 535-3285
Type: Mailing
1 MEDICAL CENTER BLVD
CHESTER, PA 190133902
Phone: (610) 447-2000
Type: Location
540 Woodbourne Rd
Langhorne, PA 190471835
Phone: (215) 750-7771
Type: Location
1412 S 7TH ST APT 3
PHILADELPHIA, PA 191475805
Phone: (831) 535-3285
Type: Mailing
3401 N BROAD ST
PHILADELPHIA, PA 191405189
Phone: (800) 836-7536
Type: Location
100 K JOHNSON BLVD STE 102
BORDENTOWN, NJ 085052275
Phone: (609) 537-7200
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $30.
Total Amount is formed as General ($30) + Research ($0) + Ownership ($0) = $30.
Last reported payment date: 2024-06-04 • Largest payer in this snapshot: Medline Industries LP ($30).
Total Amount
$30
General + Research + Ownership
Payments
2
Total payment records
General Amount
$30
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-06-04
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Medline Industries LP | $30 |
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: 2024-08-14
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 |
|---|---|---|---|---|
| I20240814001967 | I | Obstetrics/Gynecology | PA | TBD |
| I20240814002342 | I | Obstetrics/Gynecology | NJ | 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 17036)
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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 | PA | |
| Internal Medicine | NJ | |
| Family Practice | NJ | |
| Medical Oncology | NJ | |
| Family Practice | NJ | |
| Family Practice | PA | |
| - | PA | |
| Family Practice | NJ | |
| - | NJ | |
| - | NJ |
Reviews
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