Physician Profile
John S. Mastroni, MD
Unclaimed ProfileAbout Dr. Mastroni
Based in Eureka, CA, John S. Mastroni, MD is listed in the NPI registry under ophthalmology. John graduated from Creighton University School of Medicine in 1989. According to Medicare claims data, John cared for 5,211 Medicare patients across 9,660 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and imaging of retina.
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
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (707) 443-9777
- Email not available
Practice Locations
2840 ONEIL LANE
Eureka, CA 95503
Conditions Commonly Evaluated or Treated
Within Ophthalmology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Cataracts
- Diabetic retinopathy
- Dry eye
- Glaucoma
- Macular degeneration
Cornea and external eye
- Blepharitis
- Corneal abrasion
- Corneal ulcer
- Keratoconus
- Pink eye
- Pterygium
Eyelid and tear drainage
- Blocked tear duct
- Chalazion
- Drooping eyelid
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
- Epiretinal membrane
- Retinal detachment
Eye injuries
- Foreign Object in Eye
Inflammation, neurologic, and orbit
- Thyroid eye disease
- Uveitis
Retina & vitreous
- Eye Floaters and Flashes
Procedures & services
Most searched procedures
- Cataract surgery
- Eye exam
- LASIK
- Retina surgery
Examination and imaging
- Corneal topography
- Fluorescein angiography
Cataract and lens
- Intraocular lens exchange
- YAG laser capsulotomy
Corneal procedures
- Amniotic Membrane Eye Graft
Eye diagnostics
- Optical Coherence Tomography Scan
Eye injuries
- Eye Scratch Laceration Repair
- Foreign Object Removal from Eye
Eyelid surgery
- Stye Removal
Eyelid, tear duct, and muscle
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Eyelid surgery
- Tear-duct bypass surgery
Glaucoma
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Laser eye surgery
- Laser Floater Removal
Laser procedures
- Laser Treatment for Retinal Tear
Laser vision correction
- SMILE Eye Surgery
Refractive surgery
- Clear Lens Exchange
- Implantable Contact Lenses
Tear duct & Orbit
- Orbital Decompression Surgery
- Tear Duct Plugs
Procedures Most Often Billed to Medicare
9,660 services · 5,211 patients · 15 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Injection of drug into eye | Procedure | 67028 |
1,004 | More often than most peers in Ophthalmology |
| Removal of recurring cataract in lens capsule using a laser | Procedure | 66821 |
67 | More often than most peers in Ophthalmology |
| Removal of eyelashes using forceps | Procedure | 67820 |
45 | More often than most peers in Ophthalmology |
| Laser repair to improve eye fluid flow | Procedure | 65855 |
42 | More often than most peers in Ophthalmology |
| Removal of growth of eyelid | Procedure | 67840 |
11 | Less often than most peers in Ophthalmology |
| Imaging of retina | Treatment | 92134 |
1,428 | More than most peers in Ophthalmology |
| Imaging of optic nerve | Treatment | 92133 |
852 | More than most peers in Ophthalmology |
| Exam of visual field with extended testing | Treatment | 92083 |
671 | More than most peers in Ophthalmology |
| Exam of the internal drainage system of eye | Treatment | 92020 |
230 | More often than most peers in Ophthalmology |
| Compounded drug, not otherwise classified | Drug given | J7999 |
784 | More than most peers in Ophthalmology |
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.
Other eye doctors at this location 2
Same specialty, same street address — most likely the same department or group.
Other eye doctors in Eureka 3
Same specialty, same city.
Trained at Creighton 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 1989 at Creighton University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Injection of drug into eye 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Dr. Mastroni specialize in?
Dr. Mastroni is an eye doctor in Eureka, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology”.
NPI registry
Where is Dr. Mastroni located?
Dr. Mastroni is listed at 2840 Oneil Lane, Eureka, CA 95503. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Mastroni's phone number?
The number on file is (707) 443-9777. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Mastroni's NPI number?
Dr. Mastroni's National Provider Identifier is 1568420008. 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. Mastroni go to medical school?
Dr. Mastroni attended Creighton University School of Medicine, graduating in 1989. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Mastroni been practicing?
Dr. Mastroni has 37 years experience. Calculated from a graduation year of 1989, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Mastroni do most often?
According to Medicare billing data, Dr. Mastroni performs procedures including injection of drug into eye, removal of recurring cataract in lens capsule using a laser and removal of eyelashes using forceps; provides treatments such as imaging of retina and imaging of optic nerve, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Mastroni confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Mastroni. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.