GANDIS G. MAZEIKA (M.D.) – Sleep Medicine (Psychiatry & Neurology) Physician, NPI 1679518880
Sleep Medicine (Psychiatry & Neurology) Physician
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Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
590 NEUROLOGY in WA
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Provider Addresses for GANDIS G. MAZEIKA (M.D.)
10564, 5th Avenue Northeast, Northgate, Seattle, King County, Washington, 98125, United States
SUITE 205
SEATTLE, WA 981257200
Phone: (425) 636-2400
Fax: (425) 636-2401
Type: Mailing
16150 NE 85TH ST STE 203
REDMOND, WA 980523543
Phone: (206) 427-4242
Fax: (425) 636-2401
Type: Mailing
21701 76TH AVE W STE 206
EDMONDS, WA 980267536
Phone: (425) 636-2400
Fax: (425) 636-2401
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2008-02-26
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20080226000646 | I | Neurology | WA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 96127 | Assessment of emotional or behavioral problems | 686 | 320 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 535 | 272 | $0 |
| 98976 | Device supply with scheduled recording and transmission for remote monitoring of respiratory system, per 30 days | 399 | 263 | $0 |
| G0399 | Home sleep test (hst) with type iii portable monitor, unattended; minimum of 4 channels: 2 respiratory movement/airflow, 1 ecg/heart rate and 1 oxygen saturation | 203 | 81 | $0 |
| 95819 | Measurement of brain wave activity (eeg), awake and asleep | 158 | 54 | $0 |
Insurance plans in this area (ZIP 98125)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEUROLOGY | WA | 95811 | Sleep monitoring of patient (6 years or older) in sleep lab with continued pressured respiratory assistance by mask or breathing tube | 62 | 56 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Neuropsychiatry, Neurology, Sleep Medicine | CA |
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