NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1164427308 M.D.
Verify on CMS → Colin Ma, M.D.
Ophthalmology Physician in Portland, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 22,082 in Ophthalmology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
26
Medicare Part D claims · 14 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
58%
generic claims · 42% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
79.9/100
▼ 3 pts below national avg 83.1 · Above neutral
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Colin Ma, M.D. reported a CMS MIPS final score of 79.9/100 - below the 83.1 national average - and filed 26 Medicare Part D claims in 2023.
- 79.9/100
- MIPS score · -3 vs avg
- 26
- Part D claims, 2023
- 58%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Colin Ma, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
80 30th percentile higher than 30% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Colin Ma, M.D. sits
This provider among ophthalmology physician peers
Across the 9,866 ophthalmology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Colin Ma, M.D. writes more Part D claims than 2% of them and scores higher on MIPS quality than 35% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one ophthalmology physician peer from a representative sample of 60; the gold marker is Colin Ma, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Colin Ma, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Colin Ma, M.D.?
Near national averagePrimary specialty
Ophthalmology Physician
Medicare Part D claims
26 98% vs specialty avg
MIPS final score
79.9/100 3.2 pts vs avg
Specialty distribution in Oregon
How Ophthalmology Physician compares to other specialties among Oregon providers
Medicare quality performance, MIPS
Colin Ma, M.D.'s 2023 MIPS final score plotted against the Ophthalmology Physician national average
- MIPS Final Score
- 79.9/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Ophthalmology Physician) - 79.9/100 vs national avg 83.1
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Colin Ma, M.D. appears in the CMS NPPES registry as an Ophthalmology Physician provider holding M.D. credentials at 2525 NW LOVEJOY ST, Portland, OR, 97210, with a listed phone of (503) 274-2121. NPI 1164427308 was issued on 06/15/2005.
Medicare Part D records for calendar year 2023 show 26 prescription claims written by this provider, covering 14 Medicare beneficiaries and totaling roughly $2K in drug spend, split 42% brand-name and 58% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 79.9/100 for the 2023 performance year (Quality 100, Cost 32.9), compared with the national average of 83.1.
Ophthalmology Physician is a mid-sized specialty nationwide, with 22,082 enrolled providers across 56 states and an average of 1,420 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1164427308 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/15/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
79.8757
Final Score
Avg: 83.1
100
Quality
32.919
Cost
Reporting: Group practice
Brand vs generic prescribing mix · Above average
Colin Ma, M.D. - brand share 42.0%
Ophthalmology Physician average
42% brand-name claims vs 58% generic, on 26 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
26
Total Claims
$2K
Total Drug Cost
14
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 38
- Total Day Supply
- 1,051
- Brand vs Generic
- 42% brand / 58% generic
- Brand Drug Cost
- $2K
- Generic Drug Cost
- $380
Patient Demographics
- Average Patient Age
- 74.6 years
- Avg HCC Risk Score
- 1.33
Ophthalmology Physician Overview
How Colin Ma, M.D. fits within the Ophthalmology Physician landscape nationally.
22,082
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider
Colin Ma, M.D.'s 26 claims are below the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Ma.
Dr. Aazy Aaby
MD
Portland, OR
Dr. Blake Acohido
M.D.
Portland, OR
Dr. Bart Adams
MD
Pendleton, OR
Dr. Christopher Aderman
M.D.
Troutdale, OR
Dr. Talal Alabduljalil
MD
Portland, OR
Compare Ophthalmology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Oregon medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Ophthalmology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Colin Ma, M.D.'s specialty? ▼
Colin Ma, M.D. specializes in Ophthalmology Physician and practices in Portland, Oregon. Credentials: M.D..
How much does Colin Ma, M.D. prescribe under Medicare Part D? ▼
In 2023, Colin Ma, M.D. wrote 26 Medicare Part D claims totaling $2K in drug costs for 14 beneficiaries.
What is Colin Ma, M.D.'s Medicare quality score? ▼
Colin Ma, M.D. has a CMS MIPS Final Score of 79.9/100 (Quality: 100, Cost: 32.9). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Colin Ma, M.D. located? ▼
Colin Ma, M.D. is located at 2525 NW LOVEJOY ST, Portland, OR, 97210. Phone: (503) 274-2121.
What is Colin Ma, M.D.'s NPI number? ▼
Colin Ma, M.D.'s National Provider Identifier (NPI) is 1164427308, issued on 06/15/2005.
Does Colin Ma, M.D. prescribe more brand-name or generic drugs? ▼
Colin Ma, M.D.'s prescribing is 42% brand-name and 58% generic drugs by claim count, with $2K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,082 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
Does Colin Ma, M.D. accept Medicare? ▼
Colin Ma, M.D. appears in CMS Medicare data with 26 Part D claims and 14 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Colin Ma, M.D.'s credentials? ▼
Colin Ma, M.D.'s NPI is 1164427308 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.