Physician

Abigail Nisan, MD

Internal medicine San Angelo, TX Shannon Clinic

According to 2025 Medicare claims, Abigail Nisan, MD (NPI: 1336445956) practices internal medicine in the San Angelo, TX market, with the plurality of this provider's patient population coming from Tom Green, TX. This provider's primary affiliated billing organization is Shannon Clinic (NPI: 1770587149; TIN: ).

Nisan's data goes back to 2012 and runs through 2026. For example, in 2023, this provider had 337 traditional Medicare patients, billed 557 HCPCS/CPT codes, and received $54,844 in Medicare payments. Part D data shows 106 prescription claims across 45 beneficiaries totaling $4,502 in drug costs, and DME data shows 14 claims. No Open Payments records.

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10-Year Trend of Part B billing

Medicare payment trend, with patients and services in the table.

Year	Patients	Services	Medicare Payment
2014	320	763	$62,402
2015	419	1,757	$116,950
2016	548	1,645	$132,049
2017	685	1,311	$124,958
2018	578	659	$86,631
2019	577	800	$96,045
2020	431	761	$87,579
2021	378	570	$68,061
2022	363	560	$61,701
2023	337	557	$54,844

10-Year Trend of Part D records

Prescription claims trend, with patients and drug cost in the table.

Year	Patients	Claims	Drug Cost
2014	138	337	$8,852
2015	167	446	$25,005
2016	152	490	$23,152
2017	118	312	$13,766
2018	13	40	$1,297
2019	27	68	$6,530
2020	57	137	$8,180
2021	35	62	$4,788
2022	45	75	$6,434
2023	45	106	$4,502

10-Year Trend of DME records

DME claim records trend, with patients and payment in the table.

Year	Patients	Claims	Medicare Payment
2014	15	40	$6,835
2015	13	37	$4,706
2016	15	44	$3,021
2017	Not reported for this year	11	$644
2018	Not reported for this year	Not reported for this year	Not reported for this year
2019	Not reported for this year	15	$867
2020	11	15	$3,322
2021	Not reported for this year	Not reported for this year	Not reported for this year
2022	Not reported for this year	Not reported for this year	Not reported for this year
2023	Not reported for this year	14	$1,688

Top 5 Part B billing codes in 2023

By N of patients.

No connected Part B code-level records for 2023.

Top 5 Part D drugs in 2023

By N of patients.

No connected Part D drug-level records for 2023.

Top 5 DME in 2023

By N of patients.

DME	Patients	Claims	Services	Medicare Payment
All DME supplier activity	Not reported for this year	14	23	$1,688
Durable medical equipment	Not reported for this year	14	23	$1,688
Prosthetics, orthotics, and supplies	Not reported for this year	0	0	$0
DME drugs	Not reported for this year	0	0	$0

DME category summary is shown when item-level DME rows are not connected.

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Part B billing, Part D prescribing, DME records, yearly summaries, source JSON, and source notes.

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