Physician Profile
Unclaimed ProfileAbout O'BLOCK
John Michael O'Block, O.D. practises optometry in Derry, NH. John is a 2004 graduate of New England College of Optometry. John is also listed as specialising in optometrist.
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
Areas of Expertise
Common questions
What kind of doctor is Dr. O'Block?
Dr. O'Block is an optometry in Derry, NH. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “OPTOMETRY”.
NPI registry
What is Dr. O'Block's address?
Dr. O'Block is listed at 6 TSIENNETO ROAD SUITE 101, Derry, NH 03038. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. O'Block?
The number on file is (603) 434-4193. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. O'Block's NPI number?
Dr. O'Block's National Provider Identifier is 1427200724. 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. O'Block train?
Dr. O'Block attended New England College of Optometry, graduating in 2004. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. O'Block been practising?
Dr. O'Block has 22 years experience. Calculated from a graduation year of 2004, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. O'Block perform?
According to Medicare billing data, Dr. O'Block provides treatments such as photography of the 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. O'Block confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. O'Block. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (603) 434-4193
- Email not available
Practice Locations
6 TSIENNETO ROAD SUITE 101
Derry, NH 03038
Procedures Most Often Billed to Medicare
915 services · 827 patients · 8 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Photography of the retina | Treatment | 92250 |
105 |
| Imaging of optic nerve | Treatment | 92133 |
55 |
| Exam of visual field with extended testing | Treatment | 92083 |
50 |
| Imaging of retina | Treatment | 92134 |
39 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
376 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
200 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
75 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
15 |
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.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other optometry specialists in Derry 6
Same specialty, same city.
Trained at New England College of Optometry 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2004 at New England College of Optometry 8
Providers who graduated from the same medical school in the same year.
Also performs Photography of the retina 8
Providers in NH who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.