Stevie Mazyck, MD
NPI 1902835697 · Internal Medicine Physician · Walla Walla, WA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stevie Mazyck, MD is a Internal Medicine Physician provider in Walla Walla, WA (NPI 1902835697).
Provider details
- NPI number
- 1902835697
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036109544 (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 tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
198 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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 170 | $169 |
| Prolonged Hospital Inpatient Or Observation Care Evaluation and Management Service(s) Beyond the Total Time for the Primary Service (when the Primary Service Has Been Selected Using Time on the Date of the Primary Service); Each Additional 15 Minutes By ThG0316 | 28 | $29 |
Typical Medicare-allowed amounts for these services range $29–$169 (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.
Practice location
Mailing address
Additional practice locations (1)
- 820 N Chelan AveWenatchee, WA 98801-2028Phone: (509) 663-8711
Registry dates
- Enumerated
- 2006-07-03
- Last updated
- 2023-10-25
- Certified
- 2023-10-25
Frequently asked questions
- What is Stevie Mazyck's NPI number?
- Stevie Mazyck's National Provider Identifier (NPI) is 1902835697, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stevie Mazyck's specialty?
- Stevie Mazyck is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stevie Mazyck located?
- Stevie Mazyck's practice location on file with NPPES is 401 W Poplar St, Walla Walla, WA 99362-2846.
- What is Stevie Mazyck's phone number?
- The practice phone number listed in the NPPES registry for Stevie Mazyck is (509) 897-3320.
- Does Stevie Mazyck accept Medicare?
- Stevie Mazyck is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stevie Mazyck's NPI active?
- Yes — Stevie Mazyck's NPI (1902835697) is active in the NPPES registry as of the last update on 2023-10-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.