I44.7: Left bundle-branch block, unspecified

I44.7, left bundle-branch block, unspecified, is listed as a covered diagnosis in 7 Medicare billing and coding articles that apply to 37 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 5 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 I44.7 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
C7539	Insertion of new or replacement of permanent pacemaker with atrial and ventricular transvenous electrode(s), with insertion of pacing electrode, cardiac venous system, for left ventricular pacing, at time of insertion of implantable defibrillator or pacemaker pulse generator (eg, for upgrade to dual chamber system)	Special coverage instructions apply	—	1
C7538	Insertion of new or replacement of permanent pacemaker with ventricular transvenous electrode(s), with insertion of pacing electrode, cardiac venous system, for left ventricular pacing, at time of insertion of implantable defibrillator or pacemaker pulse generator (e.g., for upgrade to dual chamber system)	Special coverage instructions apply	—	1
C7540	Removal of permanent pacemaker pulse generator with replacement of pacemaker pulse generator, dual lead system, with insertion of pacing electrode, cardiac venous system, for left ventricular pacing, at time of insertion of implantable defibrillator or pacemaker pulse generator (eg, for upgrade to dual chamber system)	Carrier judgment	—	1
C7537	Insertion of new or replacement of permanent pacemaker with atrial transvenous electrode(s), with insertion of pacing electrode, cardiac venous system, for left ventricular pacing, at time of insertion of implantable defibrillator or pacemaker pulse generator (e.g., for upgrade to dual chamber system)	Special coverage instructions apply	—	1
G0448	Insertion or replacement of a permanent pacing cardioverter-defibrillator system with transvenous lead(s), single or dual chamber with insertion of pacing electrode, cardiac venous system, for left ventricular pacing	Carrier judgment	—	1
A9500	Technetium tc-99m sestamibi, diagnostic, per study dose	Carrier judgment	—	2
A9502	Technetium tc-99m tetrofosmin, diagnostic, per study dose	Carrier judgment	—	2
A9505	Thallium tl-201 thallous chloride, diagnostic, per millicurie	Carrier judgment	—	2
A9501	Technetium tc-99m teboroxime, diagnostic, per study dose	Carrier judgment	—	2
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
A9512	Technetium tc-99m pertechnetate, diagnostic, per millicurie	Carrier judgment	—	1
A9560	Technetium tc-99m labeled red blood cells, diagnostic, per study dose, up to 30 millicuries	Carrier judgment	—	1
A9538	Technetium tc-99m pyrophosphate, diagnostic, per study dose, up to 25 millicuries	Carrier judgment	—	1
A9520	Technetium tc-99m tilmanocept, diagnostic, up to 0.5 millicuries	Carrier judgment	—	1
C9176	Tc-99m from domestically produced non-heu mo-99, [minimum 50 percent], full cost recovery add-on, per study dose	Special coverage instructions apply	—	1
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

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

Medicare policy articles listing I44.7

A56391: Billing and Coding: Implantable Automatic Defibrillators (WPS Insurance Corporation (MAC - Part A, MAC - Part B); 5 Level II codes)
A56743: Billing and Coding: Cardiovascular Nuclear Medicine (Wellpoint Federal (MAC - Part A, MAC - Part B); 9 Level II codes). LCD with the same title: L33560, L33960
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
I44.5 — Left posterior fascicular block
I44.60 — Unspecified fascicular block
I44.69 — Other fascicular block

Frequently asked questions

Does Medicare cover I44.7 (Left bundle-branch block, unspecified)?

Medicare covers items and services, not diagnoses. 7 Medicare billing and coding articles list I44.7 as a covered diagnosis for 37 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 I44.7?

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 I44.7?

A56391 (Billing and Coding: Implantable Automatic Defibrillators); A56743 (Billing and Coding: Cardiovascular Nuclear Medicine); A57183 (Billing and Coding: Cardiovascular Stress Testing, Including Exercise and/or Pharmacological Stress and Stress Echocardiography), and 4 more articles.

What is ICD-10-CM code I44.7?

I44.7 is the ICD-10-CM code for left bundle-branch block, unspecified, 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