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KNOPF, WILLIAMMD NPI 1922007541 Clinician

Cardiology · MACON, GA

Specialty Cardiology — from billed Medicare claims
Trained EMORY UNIVERSITY SCHOOL OF MEDICINE — medical school, self-reported to CMS
In practice about 47 years since medical school (class of 1979, self-reported to CMS)
Location MACON, GA · NPPES registered location
Active in data Billed Medicare 2020–2024 (5 consecutive years)
Scale 50 codes billed · 20,755 disclosed services (CY2024 — most recent year in data)
Current groups
member of 4 groups; the volumes below are this clinician's personal volume and are not attributed to any single group

Group affiliation since 2019

20192026
HEALTH SERVICES OF CENTRAL GEORGIA
2025–2026
CRH PHYSICIAN PRACTICES, LLC
2024–2026
COFFEE REGIONAL MEDICAL CENTER INC
2022–2026
MIDDLE GEORGIA HEART AND VASCULAR CENTER, LLC
2019–2026
TIFT REGIONAL HEALTH SYSTEM INC
2022–2023
PHOEBE PHYSICIAN GROUP INC
2021–2022
HEALTH SERVICES OF CENTRAL GEORGIA
2019–2022
TIFT REGIONAL HEALTH SYSTEM INC
2020

The roster archive begins in 2019, so a span starting at 2019 may reach back further. Membership spans only — no volume is attributed to any group here.

NPPES registry · CMS Doctors & Clinicians registry · Medicare Part B physician/supplier claims · NPPES record last updated 2022-03

Year: 2024 · 2023 · 2022  · 2021  · 2020 

Provider overview · all codes · CY2024

The full analytics for this provider

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The billed-volume positioning, practice focus, and economics behind this provider — computed on the same disclosed Medicare Part B data.

This provider's disclosed Medicare payments across all codes were in CY2024. Unlock to see the figure.

  • Payment, service & beneficiary totals — the disclosed scale, all codes
  • Practice profile — focus & reach — top codes by share of services
  • Office vs. facility setting mix — place-of-service code split
  • Volume over five years — discrete yearly counts, no rate
  • Peer positioning — service volume — percentile among specialty peers, cohort & year disclosed
  • Peer positioning — code breadth — how many codes billed, vs peers

Peer positioning shows billed-volume and code-breadth positions among specialty peers, not measures of care (a provider's true volume position can only be higher, never lower). All figures disclosed Medicare Part B fee-for-service; volumes are personal to this NPI, not attributed to any group.

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Procedures billed to Medicare Part B (2024)

Medicare Part B FFS · CY2024 · as published by CMS
CodeDescription Services Beneficiary-episodes Avg charge Avg Medicare payment
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
99458 Management using the results of remote vital sign monitoring per calendar month, each additional 20 minutes
99457 Management using the results of remote vital sign monitoring per calendar month, first 20 minutes
93000 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
99454 Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days
J2785 Injection, regadenoson, 0.1 mg
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month
93306 Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
A9502 Technetium tc-99m tetrofosmin, diagnostic, per study dose
93015 Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision and review by physician
78452 Nuclear medicine studies of heart muscle at rest and with stress and spect
80053 Blood test, comprehensive group of blood chemicals
99439 Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test
80061 Blood test, lipids (cholesterol and triglycerides)
G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
93228 Electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional
83880 Natriuretic peptide (heart and blood vessel protein) level
83735 Magnesium level
99213 Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
93880 Ultrasound of both sides of head and neck blood flow
G0506 Comprehensive assessment of and care planning for patients requiring chronic care management services (list separately in addition to primary monthly care management service)
93458 Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
93978 Complete ultrasound of aorta, vena cava, groin vessels or bypass grafts
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
99426 Principal care management services for a single high-risk disease, first 30 minutes of clinical staff time directed by health care professional, per calendar month
84443 Blood test, thyroid stimulating hormone (tsh)
99491 Chronic care management services for two or more chronic conditions, first 30 minutes provided personally by health care professional, per calendar month
92928 Insertion of stents with balloon dilation of coronary artery or branch, single artery or branch
99152 Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes
80048 Blood test, basic group of blood chemicals (calcium, total)
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
93923 Complete ultrasound study of arm and leg arteries
93272 Electrocardiogram (ecg) up to 30 days continuous with symptom monitoring, transmission and review and report by health care professional
J0280 Injection, aminophyllin, up to 250 mg
93270 Electrocardiogram (ecg) up to 30 days continuous with symptom monitoring
93248 Heart rhythm review and interpretation of continous external ekg over 8-15 days
93459 Insertion of tube in left lower heart chamber, coronary artery and bypass graft for diagnosis with review by radiologist
83036 Hemoglobin a1c level
93975 Complete ultrasound of abdomen and pelvis artery and vein blood flow
33285 Insertion of heart rhythm monitor under skin
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
93308 Ultrasound of heart, follow-up
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count
93925 Ultrasound of leg arteries or artery grafts

These are this provider's own Medicare Part B fee-for-service volumes (CMS public data). CMS suppresses rows with fewer than 11 beneficiaries, so low-volume codes may be missing entirely — absence is not zero. Beneficiary-episodes count CMS's per-setting beneficiary figures, not unique patients. Average charge and average Medicare payment are weighted by service volume across office and facility settings. Volumes on this page are personal to the NPI and are not attributed to any physician group. See Methods & Sources.