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WILLIAM B DIECK MD
NPI 1316051360
Ophthalmology in Mount Kisco, NY

Active since August 18, 2006PECOS Enrolled
91.58/100
CMS Quality Rating
185 KISCO AVE STE 500, MOUNT KISCO, NY 10549(914) 666-4939(914) 242-7209 Get Directions Write a Review

NPPES record last updated: November 8, 2016. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William B Dieck Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM B DIECK MD (NPI 1316051360) is an individual ophthalmology provider in Mount Kisco, New York, licensed in New York (160917) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1316051360
Entity TypeIndividualMale
Primary Taxonomy207W00000X
Provider Legal NameWILLIAM B DIECKCredential: MD
Location Address185 KISCO AVE STE 500Mount Kisco, NY 10549-1409
Mailing Address185 Kisco Ave Ste 500Mount Kisco, NY 10549-1409 · (914) 666-4939 · Fax (914) 242-7209
Phone(914) 666-4939
Fax(914) 242-7209
Sole ProprietorNo
Enumeration DateAugust 18, 2006
Last NPPES UpdateNovember 8, 2016
✔ NPI 1316051360 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
License✔ Licensed in NY · 160917
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
185 KISCO AVE STE 500, Mount Kisco, NY 10549
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Other Identifiers 2

Medicare PIN22E49WS371NY
Medicare UPINA61338

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William B Dieck Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show William Dieck reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Westchester Health Medical, P.C.
4.9 mi
Allergy & Immunology
190 GOLDENS BRIDGE RD
Katonah, NY 10536
  • Reassigned Medicare billing, New York enrollment
  • Medicare enrollment name: Westchester Health Medical PC
  • 150 clinicians in this Medicare group
NPI 1386188647 (914) 232-3255

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 13

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient complete exam of visual system 92014
An established patient complete exam of the visual system involves a thorough check of your eyes and vision. It assesses eye health, checks for diseases, and measures your ability to see clearly at different distances. It's a routine, non-invasive procedure.
843 services807 patients
Established patient problem focused exam of visual system 92012
This is a routine check-up for existing patients focusing on the visual system. It involves examining your eyes to detect any potential issues or changes in your vision. It's a crucial part of maintaining good eye health.
444 services253 patients
Imaging of optic nerve 92133
Imaging of the optic nerve is a non-invasive procedure that captures detailed pictures of your optic nerve. It helps doctors assess eye health, particularly for conditions like glaucoma. It's painless, quick, and uses safe technology like MRI or OCT (Optical Coherence Tomography).
390 services210 patients
Exam of visual field with extended testing 92083
An extended visual field exam is a detailed test to evaluate your peripheral (side) vision. It helps to detect any potential blind spots which may not be noticeable in daily life. These could be caused by eye diseases like glaucoma, or neurological conditions.
163 services158 patients
Imaging of retina 92134
Imaging of the retina is a non-invasive procedure that captures detailed images of your eye's interior. This helps detect conditions like macular degeneration or retinal detachment. It's painless and takes only a few minutes.
147 services141 patients
Exam of the internal drainage system of eye 92020
This is a procedure where your doctor examines the eye's internal drainage system, essential for maintaining eye pressure. They use specialized tools to check for blockages or damage that might lead to conditions like glaucoma. It's non-invasive and painless.
128 services127 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10549 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
Established Patient
$83.44 typical visit price
range $21.66 – $164.45
Typical copayment $20.86 (range $5.41 – $41.11)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

91.58/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality90.09
Improvement Activities40

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Dieck's NPI number?

The NPI number for William Dieck is 1316051360. It was assigned to this individual provider in the NPPES registry on August 18, 2006.

Where is William Dieck located?

William Dieck practices at 185 Kisco Ave Ste 500, Mount Kisco, NY 10549. The listed phone number is (914) 666-4939.

What is William Dieck's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is William Dieck enrolled in Medicare?

Yes. William Dieck is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Dieck's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Dieck reassigns Medicare benefits to Westchester Health Medical, P.C. (Katonah, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Dieck's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for William Dieck was last updated on November 8, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.