Rex Smith, MD PHD
NPI 1801870910 · Immunopathology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rex Smith, MD PHD is a Immunopathology Physician provider in Boston, MA (NPI 1801870910).
Provider details
- NPI number
- 1801870910
- Entity type
- Individual
- Primary specialty
- Immunopathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD PHD
- Sex
- Male
- License
- 150072 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,399 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Antibody Evaluation, Each Additional Single Antibody Stain Procedure88350 | 340 | $30 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 210 | $38 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 199 | $12 |
| Antibody Evaluation, Initial Single Antibody Stain Procedure88346 | 136 | $37 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 97 | $27 |
| Pathology Examination of Tissue Using a Microscope, Moderately High Complexity88307 | 94 | $84 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-01
- Last updated
- 2025-09-11
Frequently asked questions
- What is Rex Smith's NPI number?
- Rex Smith's National Provider Identifier (NPI) is 1801870910, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Smith's specialty?
- Rex Smith is listed in the NPPES registry with a primary specialty of Immunopathology Physician (Allopathic & Osteopathic Physicians).
- Where is Rex Smith located?
- Rex Smith's practice location on file with NPPES is 55 Fruit Street, Boston, MA 02114-2696.
- What is Rex Smith's phone number?
- The practice phone number listed in the NPPES registry for Rex Smith is (617) 726-1835.
- Does Rex Smith accept Medicare?
- Rex Smith is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rex Smith's NPI active?
- Yes — Rex Smith's NPI (1801870910) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.