William Giakas, M.D.
NPI 1821009127 · Psychiatry Physician · Rockford, IL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Giakas, M.D. is a Psychiatry Physician provider in Rockford, IL (NPI 1821009127).
Provider details
- NPI number
- 1821009127
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 36083961 (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
1,081 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) |
|---|---|---|
| Treatment Using Magnetic Field to Stimulate Nerve Cells in Brain, Subsequent Delivery and Management90868 | 674 | $205 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 118 | $110 |
| Assessment of Emotional Or Behavioral Problems96127 | 115 | $4 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 79 | $62 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 39 | $140 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alprazolam | 154 | 31 |
| Zolpidem Tartrate | 64 | 16 |
| Olanzapine | 62 | 14 |
| Esketamine Hclbrand: Spravato | 60 | — |
| Fluoxetine Hcl | 53 | — |
| Sertraline Hcl | 51 | 15 |
| Duloxetine Hcl | 42 | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$32 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
- 2006-08-11
- Last updated
- 2015-09-24
Frequently asked questions
- What is William Giakas's NPI number?
- William Giakas's National Provider Identifier (NPI) is 1821009127, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Giakas's specialty?
- William Giakas is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is William Giakas located?
- William Giakas's practice location on file with NPPES is 1639 N Alpine, Rockford, IL 61107.
- What is William Giakas's phone number?
- The practice phone number listed in the NPPES registry for William Giakas is (815) 654-7772.
- Does William Giakas accept Medicare?
- William Giakas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Giakas's NPI active?
- Yes — William Giakas's NPI (1821009127) is active in the NPPES registry as of the last update on 2015-09-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.