WILLIAM CHARLES JR. O'CALLAHAN (MD) – Emergency Medicine Physician, NPI 1114964186
Emergency Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,682 EMERGENCY MEDICINE in MA
Provider Addresses for WILLIAM CHARLES JR. O'CALLAHAN (MD)
2040 Boston Road
Ste 5
Wilbraham, MA 010951380
Phone: (413) 599-3800
Fax: (413) 279-1900
Type: Location
688 Bliss Road
Longmeadow, MA 011061534
Phone: (413) 567-0011
Fax: (413) 567-0013
Type: Location
2040 Boston Rd Ste 5
Wilbraham, MA 010951380
Phone: (413) 599-3800
Fax: (413) 279-1900
Type: Location
5 SHREWSBURY ST STE D
HOLDEN, MA 015201960
Phone: (508) 829-3800
Fax: (508) 829-3802
Type: Mailing
Newton-Wellesley Hospital, 2014, Washington Street, Newton Lower Falls, Newton, Middlesex County, Massachusetts, 02462, United States
NEWTON WELLESLEY HOSPITAL
NEWTON, MA 024621607
Phone: (617) 243-6040
Fax: (617) 243-6924
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: 2008-05-06
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 |
|---|---|---|---|---|
| I20080506000317 | I | Emergency Medicine | 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.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 217 | 202 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 101 | 101 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 89 | 87 | $0 |
| 87636 | Detection test by multiplex amplified probe technique for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) (covid-19) and influenza virus types a and b | 87 | 86 | $0 |
| 71046 | X-ray of chest, 2 views | 85 | 78 | $0 |
Insurance plans in this area (ZIP 01095)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | MA | |
| - | MA | |
| Physician Assistant | NH | |
| Physician Assistant | MA | |
| Physician Assistant | MA | |
| - | MA | |
| - | MA | |
| Physician Assistant | MA | |
| Nurse Practitioner | MA | |
| Physician Assistant | MA |
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