Michael May, M.D.
NPI 1649380874 · Ophthalmology Physician · Portland, OR
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael May, M.D. is a Ophthalmology Physician provider in Portland, OR (NPI 1649380874).
Provider details
- NPI number
- 1649380874
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD25495 (OR)
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 tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 1,347 | 440 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 489 | 159 |
| Prednisolone Acetate | 421 | 264 |
| Brimonidine Tartrate | 418 | 146 |
| Timolol Maleate | 347 | 122 |
| Dorzolamide Hcl | 142 | 43 |
| Brinzolamide | 133 | 37 |
| Latanoprostene Bunodbrand: Vyzulta |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$101 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
- 2006-08-30
- Last updated
- 2007-07-08
Frequently asked questions
- What is Michael May's NPI number?
- Michael May's National Provider Identifier (NPI) is 1649380874, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael May's specialty?
- Michael May is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael May located?
- Michael May's practice location on file with NPPES is 3600 N Interstate Ave, Portland, OR 97227-1106.
- What is Michael May's phone number?
- The practice phone number listed in the NPPES registry for Michael May is (503) 331-6330.
- Does Michael May accept Medicare?
- Michael May is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael May's NPI active?
- Yes — Michael May's NPI (1649380874) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.