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Edit this profileAt a glance
- 2840 Oneil Lane, Eureka, CA 95503
About 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. NPI 1568420008 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
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
Is this your home address or personal number? Hide it
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
Eye injury and cancer
- Chemical injury to the eye
- Foreign body in the eye
- Hyphema
- Open-globe eye injury
Inflammation, neurologic, and orbit
- Optic neuritis
- Optic neuropathy
- Orbital cellulitis
- Thyroid eye disease
- Uveitis
Most searched conditions
Cornea and external eye
Eyelid and tear drainage
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
- Epiretinal membrane
- Retinal detachment
Eye injuries
Retina & vitreous
Procedures & services
Cataract and lens
- Cataract surgery with lens implant
- Laser-assisted cataract surgery
- Intraocular lens exchange
- YAG laser capsulotomy
Cornea and refractive
- Endothelial corneal transplant
Emergency and minor
- Corneal rust-ring removal
- Removal of an eye foreign body
- Repair of an eye or eyelid laceration
- Repair of ruptured globe
Examination and imaging
- Eye ultrasound
- Slit-lamp examination
- Visual-field testing
- Corneal topography
- Fluorescein angiography
Eyelid, tear duct, and muscle
- Chalazion removal
- Ectropion repair
- Eyelid surgery
- Tear-duct probing
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Tear-duct bypass surgery
Glaucoma
- Cyclophotocoagulation
- Trabeculectomy
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Retina
- Macular hole surgery
- Pneumatic retinopexy
- Retinal laser treatment
- Scleral buckle surgery
- Vitrectomy
Most searched procedures
- Cataract surgery
- Eye exam
- LASIK
- Retina surgery
Corneal procedures
- Amniotic Membrane Eye Graft
Eye diagnostics
Eye injuries
- Eye Scratch Laceration Repair
- Foreign Object Removal from Eye
Eyelid surgery
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. Contact the office directly to confirm availability and scheduling.
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
Guide.md listings do not constitute medical advice or an endorsement.