Gerald Lewis, CNS, BC
NPI 1639279177 · Psychiatric/Mental Health Clinical Nurse Specialist · Merrillville, IN
Enrolled with Medicare as Practitioner - Certified Clinical Nurse Specialist (cns) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gerald Lewis, CNS, BC is a Psychiatric/Mental Health Clinical Nurse Specialist provider in Merrillville, IN (NPI 1639279177).
Provider details
- NPI number
- 1639279177
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Clinical Nurse SpecialistPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CNS, BC
- Sex
- Male
- Sole proprietor
- Yes
- License
- 70000167 (IN)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,073 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 847 | $71 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 194 | $100 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 32 | $156 |
Typical Medicare-allowed amounts for these services range $71–$156 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 98 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alprazolam | 626 | 102 |
| Clonazepam | 441 | 82 |
| Fluoxetine Hcl | 434 | 69 |
| Trazodone Hcl | 357 | 76 |
| Quetiapine Fumarate | 343 | 67 |
| Duloxetine Hcl | 336 | 52 |
| Mirtazapine | 275 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$84,279 across 306 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
Additional practice locations (1)
- 3000 Murvihill RdValparaiso, IN 46383-5960Phone: (219) 286-3907Fax: (219) 286-3911
Registry dates
- Enumerated
- 2006-09-24
- Last updated
- 2023-11-13
- Certified
- 2023-11-13
Frequently asked questions
- What is Gerald Lewis's NPI number?
- Gerald Lewis's National Provider Identifier (NPI) is 1639279177, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerald Lewis's specialty?
- Gerald Lewis is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Clinical Nurse Specialist (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gerald Lewis located?
- Gerald Lewis's practice location on file with NPPES is 9120 Connecticut St Ste a, Merrillville, IN 46410-7015.
- What is Gerald Lewis's phone number?
- The practice phone number listed in the NPPES registry for Gerald Lewis is (219) 793-1233.
- Does Gerald Lewis accept Medicare?
- Gerald Lewis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gerald Lewis's NPI active?
- Yes — Gerald Lewis's NPI (1639279177) is active in the NPPES registry as of the last update on 2023-11-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.