I44.5: Left posterior fascicular block

I44.5, left posterior fascicular block, is listed as a covered diagnosis in 5 Medicare billing and coding articles that apply to 27 HCPCS Level II codes, including J0153 (Injection, adenosine, 1 mg (not to be used to report any…), J1250 (Injection, dobutamine hydrochloride, per 250 mg), J1245 (Injection, dipyridamole, per 10 mg). The articles come from 4 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.

HCPCS Level II codes with I44.5 as a covered diagnosis

Code	Description	Medicare coverage	DMEPOS fee 2026 (state range)	Articles listing it
J0153	Injection, adenosine, 1 mg (not to be used to report any adenosine phosphate compounds)	Special coverage instructions apply	—	5
J1250	Injection, dobutamine hydrochloride, per 250 mg	Special coverage instructions apply	—	5
J1245	Injection, dipyridamole, per 10 mg	Special coverage instructions apply	—	5
J0461	Injection, atropine sulfate, 0.01 mg	Special coverage instructions apply	—	4
J0280	Injection, aminophyllin, up to 250 mg	Special coverage instructions apply	—	4
A9700	Supply of injectable contrast material for use in echocardiography, per study	Special coverage instructions apply	—	3
J3490	Unclassified drugs	Special coverage instructions apply	—	2
J2785	Injection, regadenoson, 0.1 mg	Carrier judgment	—	2
Q9957	Injection, perflutren lipid microspheres, per ml	Carrier judgment	—	2
Q9956	Injection, octafluoropropane microspheres, per ml	Carrier judgment	—	2
C8921	Transthoracic echocardiography with contrast, or without contrast followed by with contrast, for congenital cardiac anomalies; complete	Special coverage instructions apply	—	2
C8922	Transthoracic echocardiography with contrast, or without contrast followed by with contrast, for congenital cardiac anomalies; follow-up or limited study	Special coverage instructions apply	—	2
C8923	Transthoracic echocardiography with contrast, or without contrast followed by with contrast, real-time with image documentation (2d), includes m-mode recording, when performed, complete, without spectral or color doppler echocardiography	Special coverage instructions apply	—	2
C8924	Transthoracic echocardiography with contrast, or without contrast followed by with contrast, real-time with image documentation (2d), includes m-mode recording, when performed, follow-up or limited study	Special coverage instructions apply	—	2
C8928	Transthoracic echocardiography with contrast, or without contrast followed by with contrast, real-time with image documentation (2d), includes m-mode recording, when performed, during rest and cardiovascular stress test using treadmill, bicycle exercise and/or pharmacologically induced stress, with interpretation and report	Special coverage instructions apply	—	2
C8929	Transthoracic echocardiography with contrast, or without contrast followed by with contrast, real-time with image documentation (2d), includes m-mode recording, when performed, complete, with spectral doppler echocardiography, and with color flow doppler echocardiography	Special coverage instructions apply	—	2
C8930	Transthoracic echocardiography, with contrast, or without contrast followed by with contrast, real-time with image documentation (2d), includes m-mode recording, when performed, during rest and cardiovascular stress test using treadmill, bicycle exercise and/or pharmacologically induced stress, with interpretation and report; including performance of continuous electrocardiographic monitoring, with physician supervision	Special coverage instructions apply	—	2
Q9955	Injection, perflexane lipid microspheres, per ml	Carrier judgment	—	2
A9500	Technetium tc-99m sestamibi, diagnostic, per study dose	Carrier judgment	—	1
A9502	Technetium tc-99m tetrofosmin, diagnostic, per study dose	Carrier judgment	—	1
A9555	Rubidium rb-82, diagnostic, per study dose, up to 60 millicuries	Carrier judgment	—	1
A9505	Thallium tl-201 thallous chloride, diagnostic, per millicurie	Carrier judgment	—	1
A9526	Nitrogen n-13 ammonia, diagnostic, per study dose, up to 40 millicuries	Carrier judgment	—	1
A4641	Radiopharmaceutical, diagnostic, not otherwise classified	Carrier judgment	—	1
A9501	Technetium tc-99m teboroxime, diagnostic, per study dose	Carrier judgment	—	1

2 more codes are listed. See every code with payment by region in Caduvo.

Medicare policy articles listing I44.5

A57183: Billing and Coding: Cardiovascular Stress Testing, Including Exercise and/or Pharmacological Stress and Stress Echocardiography (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 4 Level II codes). LCD with the same title: L34324
A56476: Billing and Coding: Cardiac Radionuclide Imaging (Palmetto GBA (MAC - Part A, MAC - Part B); 13 Level II codes). LCD with the same title: L33457
A57306: Billing and Coding: Transthoracic Echocardiography (TTE) (CGS Administrators, LLC (MAC - Part A, MAC - Part B); 19 Level II codes). LCD with the same title: L33577, L34338
A56781: Billing and Coding: Transthoracic Echocardiography (TTE) (Wellpoint Federal (MAC - Part A, MAC - Part B); 17 Level II codes). LCD with the same title: L33577, L34338
A56625: Billing and Coding: Echocardiography (Palmetto GBA (MAC - Part A, MAC - Part B); 6 Level II codes). LCD with the same title: L37379

A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.

Other I44 diagnoses (Atrioventricular and left bundle-branch block)

I44.0 — Atrioventricular block, first degree
I44.1 — Atrioventricular block, second degree
I44.2 — Atrioventricular block, complete
I44.30 — Unspecified atrioventricular block
I44.39 — Other atrioventricular block
I44.4 — Left anterior fascicular block
I44.60 — Unspecified fascicular block
I44.69 — Other fascicular block
I44.7 — Left bundle-branch block, unspecified

Frequently asked questions

Does Medicare cover I44.5 (Left posterior fascicular block)?

Medicare covers items and services, not diagnoses. 5 Medicare billing and coding articles list I44.5 as a covered diagnosis for 27 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.

Which HCPCS codes can be billed with ICD-10 I44.5?

The Level II codes from the policies most specific to this diagnosis are J0153 (Injection, adenosine, 1 mg (not to be used to report any…, 5 articles); J1250 (Injection, dobutamine hydrochloride, per 250 mg, 5 articles); J1245 (Injection, dipyridamole, per 10 mg, 5 articles); J0461 (Injection, atropine sulfate, 0.01 mg, 4 articles); J0280 (Injection, aminophyllin, up to 250 mg, 4 articles). Code choice depends on the item supplied; check each code's descriptor.

Which Medicare policy articles list I44.5?

A57183 (Billing and Coding: Cardiovascular Stress Testing, Including Exercise and/or Pharmacological Stress and Stress Echocardiography); A56476 (Billing and Coding: Cardiac Radionuclide Imaging); A57306 (Billing and Coding: Transthoracic Echocardiography (TTE)), and 2 more articles.

What is ICD-10-CM code I44.5?

I44.5 is the ICD-10-CM code for left posterior fascicular block, in category I44 (Atrioventricular and left bundle-branch block), chapter 9: Diseases of the circulatory system.

Next steps

Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.

Chapter 9: Diseases of the circulatory system · All diagnoses · HCPCS lookup