Nathan Walker, M.D.
NPI 1629087325 · Internal Medicine Physician · Champaign, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Walker, M.D. is a Internal Medicine Physician provider in Champaign, IL (NPI 1629087325).
Provider details
- NPI number
- 1629087325
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036-114466 (IL)
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
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
7,285 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 | 956 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 898 | $121 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 700 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 548 | $10 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 487 | $85 |
| Hemoglobin A1c Level |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 200 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 1,048 | 287 |
| Levothyroxine Sodium | 692 | 178 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 653 | 125 |
| Amlodipine Besylate | 650 | 201 |
| Lisinopril | 591 | 172 |
| Losartan Potassium | 391 | 117 |
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
Registry dates
- Enumerated
- 2006-08-05
- Last updated
- 2022-01-05
- Certified
- 2022-01-05
Frequently asked questions
- What is Nathan Walker's NPI number?
- Nathan Walker's National Provider Identifier (NPI) is 1629087325, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathan Walker's specialty?
- Nathan Walker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Walker located?
- Nathan Walker's practice location on file with NPPES is 1801 W Windsor Rd, Champaign, IL 61822-6217.
- What is Nathan Walker's phone number?
- The practice phone number listed in the NPPES registry for Nathan Walker is (217) 366-2660.
- Does Nathan Walker accept Medicare?
- Nathan Walker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathan Walker's NPI active?
- Yes — Nathan Walker's NPI (1629087325) is active in the NPPES registry as of the last update on 2022-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.