Vallikantha Nellaiappan, M.D
NPI 1548557812 · Endocrinology, Diabetes & Metabolism Physician · Greenfield, WI
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Vallikantha Nellaiappan, M.D is a Endocrinology, Diabetes & Metabolism Physician provider in Greenfield, WI (NPI 1548557812).
Provider details
- NPI number
- 1548557812
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Female
- Sole proprietor
- No
- License
- 125059624 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
14 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
552 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 150 | $15 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 95 | $111 |
| Blood Glucose (sugar) Test Performed By Hand-Held Instrument82962 | 80 | $3 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 56 | $149 |
| Hemoglobin A1c Level83036 | 34 | $9 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 113 | 35 |
| Alendronate Sodium | 106 | 50 |
| Semaglutidebrand: Ozempic | 79 | 30 |
| Empagliflozinbrand: Jardiance | 76 | 22 |
| Insulin Lisprobrand: Insulin Lispro Kwikpen U-100 | 67 | 21 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 62 | 32 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 across 1 record (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 (3)
- 3333 Green Bay RdNorth Chicago, IL 60064-3037Phone: (847) 578-3000
- 800 S Tillotson AveMuncie, IN 47304-4529Phone: (765) 289-5410Fax: (765) 281-2085
- 3691 Ridge Mill DrHilliard, OH 43026-7752Phone: (614) 685-3333Fax: (614) 688-9220
Registry dates
- Enumerated
- 2011-07-06
- Last updated
- 2023-10-26
- Certified
- 2023-10-26
Frequently asked questions
- What is Vallikantha Nellaiappan's NPI number?
- Vallikantha Nellaiappan's National Provider Identifier (NPI) is 1548557812, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Vallikantha Nellaiappan's specialty?
- Vallikantha Nellaiappan is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Vallikantha Nellaiappan located?
- Vallikantha Nellaiappan's practice location on file with NPPES is 4448 W Loomis Rd, Greenfield, WI 53220-4800.
- What is Vallikantha Nellaiappan's phone number?
- The practice phone number listed in the NPPES registry for Vallikantha Nellaiappan is (414) 281-5150.
- Does Vallikantha Nellaiappan accept Medicare?
- Vallikantha Nellaiappan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Vallikantha Nellaiappan's NPI active?
- Yes — Vallikantha Nellaiappan's NPI (1548557812) is active in the NPPES registry as of the last update on 2023-10-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.