KAREN THEO ISSELBACHER (MD) – Internal Medicine Physician, NPI 1508822867
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
7,722 INTERNAL MEDICINE in MA
Provider Addresses for KAREN THEO ISSELBACHER (MD)
70 HASTINGS ST
WELLESLEY, MA 024815439
Phone: (781) 772-8500
Fax: (781) 772-8501
Type: Mailing
140, Gould Street, Needham Heights, Needham, Norfolk County, Massachusetts, 02494, United States
NEEDHAM, MA 024942397
Phone: (781) 444-3550
Fax: (781) 444-3551
Type: Location
112, Glen Avenue, Thompsonville, Newton Centre, Newton, Middlesex County, Massachusetts, 02459, United States
NEWTON CENTER, MA 024592080
Phone: (781) 444-3550
Fax: (781) 444-3551
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 $46.
Total Amount is formed as General ($46) + Research ($0) + Ownership ($0) = $46.
Last reported payment date: 2024-05-16 • Largest payer in this snapshot: PFIZER INC. ($46).
Total Amount
$46
General + Research + Ownership
Payments
2
Total payment records
General Amount
$46
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-05-16
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| PFIZER INC. | $46 |
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: 2006-03-15
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 |
|---|---|---|---|---|
| I20060315000417 | I | Internal 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 |
|---|---|---|---|---|
| 36415 | Insertion of needle into vein for collection of blood sample | 113 | 61 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 79 | 63 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 78 | 51 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 50 | 50 | $0 |
| 93000 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 49 | 47 | $0 |
Insurance plans in this area (ZIP 02481)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine | MA | |
| Internal Medicine | MA | |
| Internal Medicine | MA |
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