David Knudtson, MD
NPI 1558420323 · Internal Medicine Physician · Naples, FL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Knudtson, MD is a Internal Medicine Physician provider in Naples, FL (NPI 1558420323).
Provider details
- NPI number
- 1558420323
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-081216 (IL)
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
11,362 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 2,084 | $121 |
| 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 | 2,024 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 858 | $81 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 588 | $9 |
| Hemoglobin A1c Level83036 | 509 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 133 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 793 | 268 |
| Rosuvastatin Calcium | 772 | 272 |
| Levothyroxine Sodium | 585 | 191 |
| Amlodipine Besylate | 521 | 187 |
| Lisinopril | 438 | 150 |
| Losartan Potassium | 378 | 132 |
| Metoprolol Succinate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,055 across 55 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)
- 211 Waukegan Rd Ste 200Northfield, IL 60093-2724Phone: (847) 242-6600Fax: (847) 242-6605
Registry dates
- Enumerated
- 2006-12-07
- Last updated
- 2021-07-12
- Certified
- 2021-06-08
Frequently asked questions
- What is David Knudtson's NPI number?
- David Knudtson's National Provider Identifier (NPI) is 1558420323, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Knudtson's specialty?
- David Knudtson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is David Knudtson located?
- David Knudtson's practice location on file with NPPES is 6635 Hillway Cir Ste 400, Naples, FL 34112-8757.
- What is David Knudtson's phone number?
- The practice phone number listed in the NPPES registry for David Knudtson is (239) 455-9550.
- Does David Knudtson accept Medicare?
- David Knudtson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Knudtson's NPI active?
- Yes — David Knudtson's NPI (1558420323) is active in the NPPES registry as of the last update on 2021-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.