What is Jack Greiner's specialty?

Jack Greiner (NPI 1588601280) is a Medicare-billing provider whose primary specialty is Ophthalmology in Boston, MA.

Where does Jack Greiner practice?

Jack Greiner practices in Boston, MA, based on the location reported in the CMS Medicare provider datasets for NPI 1588601280.

How much does Medicare pay Jack Greiner?

Jack Greiner (NPI 1588601280) received approximately $158K in total Medicare Part B payments, serving 567 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1588601280

Jack GreinerD.O.

OphthalmologyBoston, MAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,220

Unique beneficiaries

—

Total services

2,402

Distinct HCPCS

Medicare payment

$151K

Peer benchmark

Total Medicare services vs. 558 Ophthalmology providers in MA — above median (cohort median 1,976).

PRESCRIBING · PART D · 2024

Total Rx claims

872

Beneficiaries

—

Total drug cost

$106K

Distinct drugs

Brand share

19.6%

Top prescribed drugs

Latanoprost272 claims

Prednisolone Acetate81 claims

Ofloxacin76 claims

Brimonidine Tartrate75 claims

Bimatoprost73 claims

QUALITY · MIPS · 2024

Final MIPS score

74.1

Quality

48.1

Cost

0.0

Improvement activities

40.0

Promoting interop.

0.0

Payment adjustment

-0.11%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$125

Payment records

By payment type

Food and Beverage$125

Top paying entities

Food and Beverage$125

REFERRAL NETWORK

Where Jack Greiner's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 4 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
THE GENERAL HOSPITAL CORPORATION	24	61
Quest Diagnostics Massachusetts Llc Clinical Laboratory · Marlborough, MA	24	44
Kenneth Kenyon Ophthalmology · North Dartmouth, MA	22	79
Wayne Fowler Optometry · Lowell, MA	11	13

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events