Physician Profile
Unclaimed ProfileAbout ACKROYD
Based in Santa Rosa, CA, Gregory T. Ackroyd, M.D. is listed in the NPI registry under neurology. Gregory graduated from New York University School of Medicine in 2000. Gregory is also listed as specializing in sleep medicine (neurology). According to Medicare claims data, Gregory cared for 1,075 Medicare patients across 1,212 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (707) 525-9616
- Email not available
Practice Locations
585 W COLLEGE AVE
Santa Rosa, CA 95401
Procedures Most Often Billed to Medicare
1,212 services · 1,075 patients · 7 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Sleep study in sleep lab with continuous airway pressure (6 years or older) | Treatment | 95811 |
275 |
| Sleep study in sleep lab (6 years or older) | Treatment | 95810 |
112 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
469 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
191 |
| Home sleep test (hst) with type iv portable monitor, unattended; minimum of 3 channels | Billing code | G0400 |
79 |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
74 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
12 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other neurology specialists in Santa Rosa 8
Same specialty, same city.
Trained at New York University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2000 at New York University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Sleep study in sleep lab with continuous airway pressure (6 years or older) 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Ackroyd?
Dr. Ackroyd is a neurology in Santa Rosa, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “NEUROLOGY”.
NPI registry
What is Dr. Ackroyd's address?
Dr. Ackroyd is listed at 585 W COLLEGE AVE, Santa Rosa, CA 95401. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Ackroyd?
The number on file is (707) 525-9616. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Ackroyd's NPI number?
Dr. Ackroyd's National Provider Identifier is 1538192984. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Ackroyd train?
Dr. Ackroyd attended New York University School of Medicine, graduating in 2000. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Ackroyd been practicing?
Dr. Ackroyd has 26 years experience. Calculated from a graduation year of 2000, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Ackroyd perform?
According to Medicare billing data, Dr. Ackroyd provides treatments such as sleep study in sleep lab with continuous airway pressure and sleep study in sleep lab, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Ackroyd confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Ackroyd. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.