David Knowles, PA-C
NPI 1649560517 · Physician Assistant · Kamuela, HI
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Knowles, PA-C is a Physician Assistant provider in Kamuela, HI (NPI 1649560517).
Provider details
- NPI number
- 1649560517
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
- Physician Assistant363A00000X
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
20 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 20 | $57 |
Typical Medicare-allowed amounts for these services range $57–$57 (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 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 90 | 61 |
| Cephalexin | 42 | 41 |
| Doxycycline Monohydrate | 35 | 28 |
| Azithromycin | 35 | 32 |
| Atorvastatin Calcium | 34 | 15 |
| Baclofen | 33 | 13 |
| Amlodipine Besylate | 24 | 11 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-04-13
- Last updated
- 2021-06-21
- Certified
- 2021-06-21
Frequently asked questions
- What is David Knowles's NPI number?
- David Knowles's National Provider Identifier (NPI) is 1649560517, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Knowles's specialty?
- David Knowles is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is David Knowles located?
- David Knowles's practice location on file with NPPES is 67-1185 Mamalahoa Hwy, Kamuela, HI 96743-7304.
- What is David Knowles's phone number?
- The practice phone number listed in the NPPES registry for David Knowles is (808) 881-4500.
- Does David Knowles accept Medicare?
- David Knowles is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Knowles's NPI active?
- Yes — David Knowles's NPI (1649560517) is active in the NPPES registry as of the last update on 2021-06-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.