Gregory Ackroyd, M.D.
NPI 1538192984 · Sleep Medicine (Psychiatry & Neurology) Physician · Santa Rosa, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Ackroyd, M.D. is a Sleep Medicine (Psychiatry & Neurology) Physician provider in Santa Rosa, CA (NPI 1538192984).
Provider details
- NPI number
- 1538192984
- Entity type
- Individual
- Primary specialty
- Sleep Medicine (Psychiatry & Neurology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A84348 (CA)
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,212 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 | 469 | $138 |
| Sleep Study in Sleep Lab With Continuous Airway Pressure (6 Years Or Older)95811 | 275 | $128 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 191 | $180 |
| Sleep Study in Sleep Lab (6 Years Or Older)95810 | 112 | $126 |
| Home Sleep Test (hst) With Type IV Portable Monitor, Unattended; Minimum of 3 ChannelsG0400 | 79 | $98 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 62 | 12 |
| Armodafinil | 33 | — |
| Eszopiclone | 22 | — |
| Zolpidem Tartrate | 21 | — |
| Trazodone Hcl | 16 | — |
| Amitriptyline Hcl | 13 | — |
| Methadone Hcl | 12 | — |
| Fluticasone Propionate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$583 across 16 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
Registry dates
- Enumerated
- 2006-07-09
- Last updated
- 2021-10-14
- Certified
- 2021-10-14
Frequently asked questions
- What is Gregory Ackroyd's NPI number?
- Gregory Ackroyd's National Provider Identifier (NPI) is 1538192984, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Ackroyd's specialty?
- Gregory Ackroyd is listed in the NPPES registry with a primary specialty of Sleep Medicine (Psychiatry & Neurology) Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Ackroyd located?
- Gregory Ackroyd's practice location on file with NPPES is 585 W College Ave, Santa Rosa, CA 95401-5000.
- What is Gregory Ackroyd's phone number?
- The practice phone number listed in the NPPES registry for Gregory Ackroyd is (707) 525-9616.
- Does Gregory Ackroyd accept Medicare?
- Gregory Ackroyd is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Ackroyd's NPI active?
- Yes — Gregory Ackroyd's NPI (1538192984) is active in the NPPES registry as of the last update on 2021-10-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.