Nicholas Mahoney, MD
NPI 1194875864 · Ophthalmology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nicholas Mahoney, MD is a Ophthalmology Physician provider in Baltimore, MD (NPI 1194875864).
Provider details
- NPI number
- 1194875864
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MT188147 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1,174 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 | 544 | $137 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 96 | $179 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 81 | $99 |
| Probing of Nasal Tear Duct68840 | 71 | $192 |
| Injection of Chemical for Paralysis of Nerve Muscles on Side of Face64612 | 63 | $217 |
| Removal of Excessive Skin and Fat of Upper Eyelid15823 | 47 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Erythromycin Basebrand: Erythromycin | 109 | 84 |
| Tobramycin/Dexamethasonebrand: Tobramycin-Dexamethasone | 30 | 28 |
| Tramadol Hcl | 22 | 22 |
| Loteprednol Etabonate | 16 | — |
| Azithromycin | 15 | 14 |
| Tobramycin/Dexamethasonebrand: Tobradex | 13 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,837 across 8 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
- 2007-01-12
- Last updated
- 2016-04-29
Frequently asked questions
- What is Nicholas Mahoney's NPI number?
- Nicholas Mahoney's National Provider Identifier (NPI) is 1194875864, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicholas Mahoney's specialty?
- Nicholas Mahoney is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Nicholas Mahoney located?
- Nicholas Mahoney's practice location on file with NPPES is 600 N Wolfe St, Baltimore, MD 21287-0005.
- What is Nicholas Mahoney's phone number?
- The practice phone number listed in the NPPES registry for Nicholas Mahoney is (410) 955-1112.
- Does Nicholas Mahoney accept Medicare?
- Nicholas Mahoney is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nicholas Mahoney's NPI active?
- Yes — Nicholas Mahoney's NPI (1194875864) is active in the NPPES registry as of the last update on 2016-04-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.