JAMES STEWART LANG (M.D.) – Internal Medicine Physician, NPI 1528488798
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 JAMES STEWART LANG (M.D.)
1493 CAMBRIDGE ST
CAMBRIDGE, MA 021391047
Phone: (617) 665-3600
Type: Mailing
55 FRUIT ST
BOSTON, MA 021142621
Phone:
Type: Mailing
151 EVERETT AVE
CHELSEA, MA 021501807
Phone: (617) 889-8520
Fax: (617) 889-8571
Type: Location
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.
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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: 2024-03-06
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 |
|---|---|---|---|---|
| I20170501002241 | I | Internal Medicine | MA | TBD |
| I20240306002367 | I | Internal Medicine | WA | 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 | 25 | 17 | $0 |
Insurance plans in this area (ZIP 02139)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | OR | |
| - | WA | |
| - | WA | |
| P A T H O L O G Y | TN | |
| Nurse Practitioner | WA | |
| Diagnostic Radiology | WA | |
| Nurse Practitioner | WA | |
| Physical Therapist In Private Practice | WA | |
| O T O L A R Y N G O L O G Y | WA | |
| Emergency Medicine | OR |
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