DR. JOHN D PFEIFER (MD) – Molecular Genetic Pathology (Pathology) Physician, NPI 1306864822
Molecular Genetic Pathology (Pathology) Physician
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NPPES metrics only — not quality of care.
406 PATHOLOGY in MO
Provider Addresses for DR. JOHN D PFEIFER (MD)
PO BOX 7412011
CHICAGO, IL 606742011
Phone: (314) 362-5641
Fax: (314) 362-0369
Type: Mailing
1 BARNES JEWISH HOSPITAL PLZ
DIV PA ANATOMIC AND MOLECULAR PATH
SAINT LOUIS, MO 631101003
Phone: (314) 362-5641
Fax: (314) 362-0369
Type: Location
660, South Euclid Avenue, Central West End, City of Saint Louis, Missouri, 63110, United States
CB 8118
SAINT LOUIS, MO 631101010
Phone: (314) 362-5641
Fax: (314) 362-0369
Type: Mailing
South Kingshighway Boulevard, North Hampton, City of Saint Louis, Missouri, 63116, United States
SAINT LOUIS, MO 631101026
Phone: (314) 362-5641
Fax: (314) 362-0369
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
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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: 2023-05-11
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 |
|---|---|---|---|---|
| I20100305000516 | I | Pathology | MO | TBD |
| I20230511002821 | I | Pathology | IL | 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 |
|---|---|---|---|---|
| 88341 | Special stained specimen slides to examine tissue, each additional procedure | 247 | 54 | $0 |
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 230 | 149 | $0 |
| 88307 | Pathology examination of tissue using a microscope, moderately high complexity | 155 | 74 | $0 |
| 88342 | Special stained specimen slides to examine tissue, initial procedure | 147 | 81 | $0 |
| 88360 | Microscopic genetic analysis of tumor, manual | 132 | 54 | $0 |
Insurance plans in this area (ZIP 60674)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PATHOLOGY | MO | 88342 | Tissue or cell analysis by immunologic technique | 20 | 19 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | MO | |
| - | MO | |
| - | FL | |
| - | MO | |
| Diagnostic Radiology | IL | |
| - | IL | |
| - | MO | |
| - | MO | |
| - | MO | |
| - | MO |
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