Why are Medicare and Medicaid shown separately instead of combined?

They come from two different CMS data sources with no shared claim identifier, so they can't be reconciled into one number without double-counting or guessing. Every table and chart on this page keeps them fully separate.

Why is there no private/commercial revenue figure?

Private and commercial payer data comes from Transparency in Coverage files, which only publish negotiated rates — not claims or utilization volume. Without a volume figure, no revenue number can be computed for any provider from that data.

What does "Rank" mean in the Competitive Analysis & Benchmarks tables?

For a given CPT/HCPCS code, it's this provider's position by claims volume among all providers billing that same code at that geography level (State, National, or Wisconsin for Medicaid) — rank 1 means the highest claims volume for that code.

Why is the Medicaid comparison limited to Wisconsin only?

Medicaid is administered per-state with no single national fee schedule, so a state or national comparison the way Medicare has one isn't available. Wisconsin (this provider's own state) is the only grouping that's conceptually meaningful.

Why are the numbers rounded to the nearest 10?

To avoid implying more precision than the underlying data supports at a single-provider level. Ratios are kept precise since they're a relative comparison, not a volume or dollar figure.

How current is this data?

The Medicare and Medicaid tables are both single current snapshots, not refreshed on a recurring schedule yet.

Shannon O'mahar (NPI 1366569899)

Field	Value
Entity Type	Individual
Organization	Shannon O'mahar
Address	1200 John Q Hammons Dr
City	Madison
State	WI
ZIP	53717
Taxonomy	Hematology & Oncology Physician
NPI Enumerated	March 22, 2007

Payer Source	Total Paid
Medicare	$1.1M
Medicaid	$0

Key Findings

SHANNON O'MAHAR is a Hematology & Oncology Physician in MADISON, WI with an NPI enumerated on 2007-03-22 (~19 years ago). Lifetime Medicare revenue on file is $1.1M and there is no Medicaid billing on file, indicating this provider’s public-payor activity is effectively single-payer Medicare at the claims level reported here.

Revenue is extremely concentrated: J9144 ($985K revenue) alone represents 86.5% of the provider’s Medicare revenue, and the precomputed top-3 Medicare codes together account for 92.9% of total Medicare revenue. This degree of concentration implies the provider’s financial exposure and operational throughput are heavily tied to a very small set of high-value therapy codes.

The code mix points to a focused oncology infusion practice: J9144 (daratumumab with hyaluronidase) is the dominant revenue driver, supported by chemotherapy administration codes such as 96413 and 96401 and E/M codes 99213 and 99214. The presence of lab codes (85025, 80053, 36415) further suggests routine in-office monitoring and supportive services consistent with active systemic therapy management.

On competitive standing for the top drug, this provider is a major participant nationally for daratumumab administration: J9144 ranks #26 of 615 providers nationally (96th percentile; notably above typical national volume for this code). That high rank indicates unusually large daratumumab volume compared with most peers.

Office visit and some infusion visit volumes have different competitive signals: 99213 ranks #20471 of 457151 providers nationally (96th percentile; notably above typical national volume for this code), while 99214 ranks in the 86th percentile (rank #67246 of 479517). Chemotherapy administration code 96413 sits near typical peer volume (62th percentile). Together these positions suggest above-average outpatient visit throughput for an oncology clinician, while routine chemotherapy administration volumes are closer to peer norms.

Some add-on infusion and sequential administration codes are relatively low versus peers (for example, 96417 ranks in the 3th percentile and 96367 ranks in the 9th percentile), which suggests limited use of multi-drug sequential infusion billing patterns compared with other oncology providers. This pattern may reflect a practice model focused on single-agent, high-volume biologic dosing sessions rather than multi-agent infusion regimens.

Payer-mix and market implications: with $1.1M in Medicare revenue and no Medicaid billing on file, the provider lacks Medicaid presence in these records, which could limit access to Medicaid populations and reduce negotiating leverage or network exposure in state Medicaid arrangements. Analysts evaluating network adequacy or contracting should treat this profile as Medicare-centric.

Operational risk and service-line implications are notable given the reliance on a single high-cost injectable: dependence on J9144 implies the practice must maintain infusion capacity, cold-chain or specialty drug handling, and inventory management for biologic therapy. Any changes in daratumumab utilization patterns, clinical guidelines, or reimbursement policy could materially affect revenue given that J9144 accounts for $985K of the $1.1M Medicare total.

Medicare: Complete Services Breakdown

The CPT/HCPCS codes generating the most Medicare revenue for this provider.

30 rows

CPT/HCPCS Code	Description	Claims	Avg Paid	Revenue
J9144	Injection, daratumumab, 10 mg and hyaluronidase‑fihj	25,920	$40	$985K
99214	The provider sees an established patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a moderate level of medical decision making, and/or the…	410	$90	$37.5K
99213	The provider sees an established patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a low level of medical decision making, and/or the…	580	$60	$35.6K
96413	Chemotherapy is a therapeutic procedure used for the treatment of cancer via the use of chemical agents. These chemical agents (drugs) work on the cancerous cells of the body to destroy them. These…	210	$100	$20.3K
96401	The provider administers nonhormonal, antineoplastic chemotherapy drugs subcutaneously or intramuscularly to the patient.	200	$50	$10.8K
J9041	Injection, bortezomib, 0.1 mg	1,980	$1	$7.9K
99204	The provider sees a new patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a moderate level of medical decision making, and/or the provider…	50	$120	$5.7K
85025	A complete blood count (better known as a CBC) is a blood test request by a doctor that provides detailed information about various types of cells in a patient's blood. Usually a pathologist or a…	680	$10	$5.4K
36415	In this procedure, the provider inserts a needle into a vein to collect a blood sample.	650	$10	$5.2K
99232	The provider sees a patient for a subsequent hospital inpatient or observation care visit involving evaluation and management (E/M). The visit involves a moderate level of medical decision making or…	70	$60	$4.1K

Showing 1–10 of 30

Medicare: Competitive Analysis & Benchmarks

How this provider's Medicare billing volume and revenue compare to other providers nationally and within its state, across 30 CPT/HCPCS codes.

View: State1 / 2

Claims Volume vs. Wisconsin Distribution

Shannon O'mahar — 6 of 25 codes billed far more than typical (above p95)

p5–p95 (all providers)p25–p75MedianThis providerOutlier

Rank Distribution — Wisconsin

Full comparison — all codes billed, vs. state median

30 rows

CPT/HCPCS Code	Rank	Provider Count	Median Claims	Avg Paid	Average Revenue
J9144	1	10	7,020	$40	$393.8K
96413	16	80	110	$90	$12.7K
99214	446	9,800	80	$70	$9.2K
99232	1,632	3,490	60	$60	$7.2K
96401	4	20	110	$50	$7.1K
80053	33	450	40	$10	$6.3K
90694	977	1,020	50	$70	$5.9K
96365	43	90	50	$50	$5.8K
J9041	1	10	790	$1	$5K
99213	84	9,380	60	$50	$4.7K

Showing 1–10 of 30

Related Providers

Other providers that share a Tax Identification Number (TIN) with Shannon O'mahar, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Dean Health Systems, Inc	WI	Allergy & Immunology Physician	$0	$26.3M
Dean Health Systems, Inc.	WI	Ambulatory Surgical Clinic/Center	$2M	$856.3K
Infinity Healthcare Physicians, S.c.	WI	Emergency Medicine Physician	$0	$2.5M
Dean Health Systems, Inc.	WI	Ambulatory Surgical Clinic/Center	$1.8M	$750K
Amol Kulkarni	WI	Ophthalmology Physician	$2.1M	$0
Mitchell Wolf	WI	Ophthalmology Physician	$1.6M	$0
James Bell	WI	Ophthalmology Physician	$1.4M	$0
Shadi Latta	IL	Hematology & Oncology Physician	$897.4K	$990
Ki Hassler	FL	Cardiovascular Disease Physician	$858.6K	$0
Joanna Zurko	WI	Internal Medicine Physician	$667.9K	$0

Nearby Providers

Other providers in the same ZIP code as Shannon O'mahar, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Lumicera Health Services, LLC	WI	Specialty Pharmacy	$0	$9.4M
Janice Scholz	WI	Behavior Analyst	$0	$5.7M
Bright Dental Madison LLC	WI	Dental Clinic/Center	$0	$5.6M
Brittany Schumacher	WI	Behavior Analyst	$0	$2.8M
Erin Junemann	WI	Behavior Analyst	$0	$2.4M
Joseph Perron	WI	Clinical Psychologist	$0	$1.9M
Jodie Deruyter	WI	Behavior Analyst	$0	$1.9M
Crystal Held	WI	Behavior Analyst	$0	$1.7M
Michelle Sherman	WI	Social Worker	$0	$1.6M
Kimberly Knippel	WI	Behavior Analyst	$0	$1.4M

Shannon O'mahar — Billing Profile & Reimbursement Data

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Key Findings

Medicare: Total Revenue Breakdown by CPT/HCPCS Code

Medicare: Complete Services Breakdown

Medicare: Competitive Analysis & Benchmarks

Related Providers

Nearby Providers

Frequently Asked Questions

References