Nidia Messias, MD
NPI 1881896041 · Anatomic Pathology & Clinical Pathology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nidia Messias, MD is a Anatomic Pathology & Clinical Pathology Physician provider in Saint Louis, MO (NPI 1881896041).
Provider details
- NPI number
- 1881896041
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 2010026538 (MO)
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 tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,083 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 435 | $27 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 161 | $11 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 98 | $35 |
| Pathology Examination of Tissue Using a Microscope, Moderately High Complexity88307 | 65 | $76 |
| Antibody Evaluation, Initial Single Antibody Stain Procedure88346 | 50 | $34 |
| Electron Microscopy for Diagnosis88348 | 49 | $72 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$271 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-06-01
- Last updated
- 2025-04-17
Frequently asked questions
- What is Nidia Messias's NPI number?
- Nidia Messias's National Provider Identifier (NPI) is 1881896041, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nidia Messias's specialty?
- Nidia Messias is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Nidia Messias located?
- Nidia Messias's practice location on file with NPPES is 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110-1003.
- What is Nidia Messias's phone number?
- The practice phone number listed in the NPPES registry for Nidia Messias is (314) 362-5641.
- Does Nidia Messias accept Medicare?
- Nidia Messias is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nidia Messias's NPI active?
- Yes — Nidia Messias's NPI (1881896041) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.