Janna Williams, MD
NPI 1033552740 · Infectious Disease Physician · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janna Williams, MD is a Infectious Disease Physician provider in Grand Rapids, MI (NPI 1033552740).
Provider details
- NPI number
- 1033552740
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 4301509242 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 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
352 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 155 | $77 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 90 | $127 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 54 | $117 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 24 | $125 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 18 | $171 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin | 33 | 11 |
| Vancomycin Hcl | 33 | — |
| Ceftriaxone Sodiumbrand: Ceftriaxone | 30 | — |
| Daptomycin | 23 | — |
| Cefazolin Sodium | 21 | — |
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 19 | — |
| Cefadroxil | 15 | — |
| Cefepime Hcl | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$37 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
- 2013-04-11
- Last updated
- 2023-09-06
- Certified
- 2023-09-06
Frequently asked questions
- What is Janna Williams's NPI number?
- Janna Williams's National Provider Identifier (NPI) is 1033552740, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janna Williams's specialty?
- Janna Williams is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Janna Williams located?
- Janna Williams's practice location on file with NPPES is 230 Michigan St Ne Ste 230, Grand Rapids, MI 49503-2550.
- What is Janna Williams's phone number?
- The practice phone number listed in the NPPES registry for Janna Williams is (616) 774-2822.
- Does Janna Williams accept Medicare?
- Janna Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janna Williams's NPI active?
- Yes — Janna Williams's NPI (1033552740) is active in the NPPES registry as of the last update on 2023-09-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.