NPI registry status
Active
2026 NPPES data Optometrist NPI 1821042854 O.D.
Verify on CMS → Tracy Giles, O.D.
Optometrist in Portland, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 61,426 in Optometrist, 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
379
Medicare Part D claims · 92 beneficiaries · Optometrist avg: 279
Generic prescribing
65%
generic claims · 35% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$52.63
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Tracy Giles, O.D. filed 379 Medicare Part D claims in 2024 as an Optometrist in Portland, Maine, prescribing 65% generic.
- 379
- Part D claims, 2024
- 65%
- generic prescribing
- $52.63
- industry payments (Sunshine Act)
- ≥56th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Tracy Giles, O.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1821042854), first enumerated 05/22/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 379 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Industry payment transparency
$52.63 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1821042854 · Optometrist
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1821042854
- ENUM-LEGACY 2006
- TAX-MEGA 61K Optometrist
- RX-LIGHT 379
- BOOK-THIN 301 in Maine
- PHOTO-ENUM Kristina Ross · 2006
Tracy Giles, O.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
379 ≥ 56th percentile 56% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. 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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Tracy Giles, O.D.?
Quality data not reportedPrimary specialty
Optometrist
Medicare Part D claims
379 36% vs specialty avg
Specialty distribution in Maine
How Optometrist compares to other specialties among Maine providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Optometrist. Verify directly:
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).
Practice Address
Provider Details
| NPI | 1821042854 |
|---|---|
| Specialty | Optometrist |
| Credentials | O.D. |
| Gender | Male |
| NPI Issued | 05/22/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Tracy Giles, O.D.. Source: openpaymentsdata.cms.gov.
Total received
$53
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Above average
Tracy Giles, O.D. - brand share 35.0%
Optometrist average
35% brand-name claims vs 65% generic, on 379 2024 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 2024.
379
Total Claims
$71K
Total Drug Cost
92
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 817.233
- Total Day Supply
- 23,815
- Brand vs Generic
- 35% brand / 65% generic
- Brand Drug Cost
- $62K
- Generic Drug Cost
- $9K
Patient Demographics
- Average Patient Age
- 76.0 years
- Avg HCC Risk Score
- 1.13
- Gender Split
- 57% female / 43% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Tracy Giles, O.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Latanoprost
Latanoprost
99 claims
- Timolol Maleate
Timolol Maleate
59 claims
- Lumigan
Lumigan
50 claims
- Dorzolamide-Timolol 31
Dorzolamide-Timolol
31 claims
- Travoprost 26
Travoprost
26 claims
- Dorzolamide Hcl 18
Dorzolamide Hcl
18 claims
- Brinzolamide 17
Brinzolamide
17 claims
| Drug | Claims |
|---|---|
| Latanoprost | 99 |
| Timolol Maleate | 59 |
| Lumigan Bimatoprost | 50 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 31 |
| Travoprost | 26 |
| Dorzolamide Hcl | 18 |
| Brinzolamide | 17 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Optometrist Overview
How Tracy Giles, O.D. fits within the Optometrist landscape nationally.
61,426
Optometrist Providers in US
56
States with Optometrist
279
Avg Claims per Provider
Tracy Giles, O.D.'s 379 claims are above the specialty average of 279.
Nationwide Optometrist peers with similar MIPS or enrollment year
Two federal-record peer sets for Giles, both outside Maine so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Optometrist Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Giles.
One of 301 Optometrist providers enrolled in Maine, 5 are shown here.
Dr. Amy Abbott
O.D.
South Portland, ME
Dr. Andre Achenbach
O.D.
Brunswick, ME
Dr. Rachel Achenbach
OD
Windham, ME
Dr. Nirupama Aggarwal
OD
Portland, ME
Dr. Paul Albert
O.D.
Ellsworth, ME
Compare Optometrist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Tracy Giles, O.D.'s specialty? ▼
Tracy Giles, O.D. specializes in Optometrist and practices in Portland, Maine. Credentials: O.D..
How much does Tracy Giles, O.D. prescribe under Medicare Part D? ▼
In 2024, Tracy Giles, O.D. wrote 379 Medicare Part D claims totaling $71K in drug costs for 92 beneficiaries.
Where is Tracy Giles, O.D. located? ▼
Tracy Giles, O.D. is located at 1039 WASHINGTON AVE, Portland, ME, 04103. Phone: (207) 775-6533.
What is Tracy Giles, O.D.'s NPI number? ▼
Tracy Giles, O.D.'s National Provider Identifier (NPI) is 1821042854, issued on 05/22/2006.
Does Tracy Giles, O.D. prescribe more brand-name or generic drugs? ▼
Tracy Giles, O.D.'s prescribing is 35% brand-name and 65% generic drugs by claim count, with $62K in brand drug costs.
How many Optometrist providers are there in the US? ▼
There are 61,426 Optometrist providers across 56 states in the US. The average Optometrist provider writes 279 Medicare Part D claims per year.
What drugs does Tracy Giles, O.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Tracy Giles, O.D.'s most frequently prescribed drugs include Latanoprost, Timolol Maleate, Lumigan. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Tracy Giles, O.D. accept Medicare? ▼
Tracy Giles, O.D. appears in CMS Medicare data with 379 Part D claims and 92 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Tracy Giles, O.D.'s credentials? ▼
Tracy Giles, O.D.'s NPI is 1821042854 with credentials O.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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- 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 August 2026 (NPPES) / 2024 (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
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 August 2026.