John Michael O'Block, OD
- Medicare patients, 2024
- 515
- Part D claims, 2024
- 265
- Industry payments
- $343
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 6 Tsienneto Rd, Derry, NH 03038
- Practice phone
- Call (603) 537-2060
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Derry Surgery Center LP
Derry, New Hampshire
Find John O'Block's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
John Michael O'Block is an optometrist in Derry, New Hampshire
John O'Block practices at Derry Surgery Center LP in Derry, New Hampshire.
John O'Block's NPI, 1427200724, was assigned on October 17, 2008. John O'Block graduated from New England College of Optometry in 2004. John O'Block holds New Hampshire license 0823.
- NPI
- 1427200724NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082778964
- NPI enumeration date
- October 17, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (603) 537-2060
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
John Michael O'Block practices at Derry Surgery Center LP in Derry, New Hampshire
John O'Block's primary practice is Derry Surgery Center LP, at 6 Tsienneto Rd, Derry, NH 03038 in Rockingham County. The practice phone is (603) 537-2060.
- Derry Surgery Center LP6 Tsienneto Rd, Derry, NH 03038 · Rockingham CountyPhone(603) 537-2060
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John Michael O'Block is affiliated with 2 sites of care and 1 medical group
John O'Block's primary practice is Derry Surgery Center LP in Derry, New Hampshire. Dmand AI also links John O'Block to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at John Michael O'Block's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John O'Block practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Derry Surgery Center LP | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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John Michael O'Block is one of 211 optometrists in New Hampshire
Optometrist is John O'Block's primary specialty in the NPI Registry, under taxonomy code 152W00000X. John O'Block is licensed in New Hampshire.
Specialties and state licenses
- Optometrist, New HampshirePrimary
Optometrists near John O'Block
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
John Michael O'Block treated 515 Medicare patients in 2024, average age 72
CMS counts 515 Medicare patients who saw John O'Block in 2024. The largest group is 65 to 74, with 309 patients. 75% of them have high cholesterol, and 64% have high blood pressure. 4% are also on Medicaid. Their average risk score is 0.98, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John O'Block's median patient age at 57, with 60% women.
John O'Block's Medicare patients by age, 2024
John O'Block's Medicare patients by sex, 2024
- Women31762%
- Men19838%
Chronic conditions among John O'Block's Medicare patients, 2024
- High cholesterol75%
- High blood pressure64%
- Arthritis38%
- Anxiety23%
- Mood disorders22%
- Depression20%
- Diabetes19%
- Chronic kidney disease18%
Share of Medicare patients with each condition. A patient can have several.
John O'Block's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John Michael O'Block wrote 265 Medicare Part D claims in 2024
In 2024, John O'Block wrote 265 Medicare Part D claims for 111 patients. 58% of them were for generic drugs.
John O'Block's Part D claims by kind of drug, 2024
- Generic153 claims58%
- Brand-name112 claims42%
Drug classes CMS tracks in John O'Block's Part D claims, 2024
- Antibiotics7%19 of 265 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How John Michael O'Block takes part in Medicare
John O'Block accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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John Michael O'Block received $343 in industry payments in 2025
CMS Open Payments shows 12 general payments to John O'Block from 6 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $141.
Companies that paid John O'Block the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
John Michael O'Block graduated from New England College of Optometry
John O'Block graduated from New England College of Optometry in 2004.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for John Michael O'Block's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about John Michael O'Block
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John Michael O'Block's NPI number?
John Michael O'Block's NPI number is 1427200724. It was assigned on October 17, 2008, and it is active in the NPI Registry.
What does John Michael O'Block specialize in?
John Michael O'Block is an optometrist in Derry, New Hampshire. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does John Michael O'Block practice?
John O'Block practices at 6 Tsienneto Rd, Derry, NH 03038. John O'Block's primary practice is Derry Surgery Center LP in Derry, New Hampshire. Dmand AI also links John O'Block to 1 group practice or clinic and 1 medical group.
What is John Michael O'Block's office phone number?
The practice phone on file for John O'Block is (603) 537-2060.
What is John Michael O'Block's medical license number?
John O'Block holds New Hampshire license 0823.
Does John Michael O'Block accept Medicare?
Yes. CMS lists John O'Block as accepting Medicare assignment.
How many Medicare patients does John Michael O'Block see?
CMS counts 515 Medicare patients who saw John O'Block in 2024, with an average age of 72.
Where did John Michael O'Block go to medical school?
John O'Block graduated from New England College of Optometry in 2004.
Has John Michael O'Block received payments from drug or device companies?
CMS Open Payments shows $343 in general payments to John O'Block from 6 companies from 2025 to 2025. The largest total came from Alcon Laboratories Inc.
How long has John Michael O'Block been practicing?
John O'Block graduated from medical school in 2004, 22 years ago.
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