DR. KATHLEEN MARY OBRIEN (MD) – Emergency Medicine Physician, NPI 1427236975
Emergency Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,682 EMERGENCY MEDICINE in MA
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Provider Addresses for DR. KATHLEEN MARY OBRIEN (MD)
Massachusetts General Hospital, 55, Fruit Street, Beacon Hill, Boston, Suffolk County, Massachusetts, 02114, United States
MASS. GENERAL HOSPITAL DEPT. OF EMERG. MEDICINE
BOSTON, MA 02214
Phone: (617) 726-0313
Type: Location
55 Fruit Street
Mass. General Hospital Dept. of Emerg. Medicine
Boston, MA 02214
Phone: (617) 726-0313
Type: Location
550 W PLUMB LN # B245
RENO, NV 895093468
Phone: (508) 769-3310
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: 2017-12-06
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 |
|---|---|---|---|---|
| I20150518000096 | I | Emergency Medicine | CA | TBD |
| I20171206001954 | I | Emergency Medicine | NV | 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 |
|---|---|---|---|---|
| 99285 | Emergency department visit with high level of medical decision making | 203 | 193 | $0 |
| 93010 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 170 | 163 | $0 |
| 99291 | Critical care, first 30-74 minutes | 48 | 47 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 32 | 32 | $0 |
Insurance plans in this area (ZIP 02214)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Hospitalist, Internal Medicine | CA | |
| Emergency Medicine | NV | |
| Family Practice | CA | |
| Emergency Medicine | CA | |
| Emergency Medicine | MS | |
| Hospice/Palliative Care, Family Practice | CA | |
| Emergency Medicine | NV | |
| Emergency Medicine | CO | |
| Hospitalist, Internal Medicine | CA | |
| Emergency Medicine | CA |
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