2026 ICD-10-CM Diagnosis Code T44.7X6AUnderdosing of beta-adrenoreceptor antagonists, initial encounter
T44.7X6A is a billable ICD-10-CM diagnosis code for underdosing of beta-adrenoreceptor antagonists, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Underdosing of drugs and medicaments, initial encounter.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for T44.7X6A.
Coding GuidelinesGuidance
Underdosing refers to taking less of a medication than is prescribed by a provider or a manufacturer's instruction. Codes for underdosing should never be assigned as principal or first-listed codes. If a patient has a relapse or exacerbation of the medical condition for which the drug is prescribed because of the reduction in dose, then the medical condition itself should be coded.
The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system (T44). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Acebutolol
a cardioselective beta-1 adrenergic antagonist with little effect on the bronchial receptors. the drug has stabilizing and quinidine-like effects on cardiac rhythm, as well as weak inherent sympathomimetic action.Alprenolol
one of the adrenergic beta-antagonists used as an antihypertensive, anti-anginal, and anti-arrhythmic agent.Atenolol
a cardioselective beta-1 adrenergic blocker possessing properties and potency similar to propranolol, but without a negative inotropic effect.Betaxolol
a cardioselective beta-1-adrenergic antagonist with no partial agonist activity.Bisoprolol
a cardioselective beta-1 adrenergic blocker. it is effective in the management of hypertension and angina pectoris.Bupranolol
an adrenergic-beta-2 antagonist that has been used for cardiac arrhythmia, angina pectoris, hypertension, glaucoma, and as an antithrombotic.Carteolol
a beta-adrenergic antagonist used as an anti-arrhythmia agent, an anti-angina agent, an antihypertensive agent, and an antiglaucoma agent.Celiprolol
a cardioselective beta-1 adrenergic antagonist that has intrinsic sympathomimetic activity. it is used in the management of angina pectoris and hypertension.Metoprolol
a selective adrenergic beta-1 blocking agent that is commonly used to treat angina pectoris; hypertension; and cardiac arrhythmias.Nadolol
a non-selective beta-adrenergic antagonist with a long half-life, used in cardiovascular disease to treat arrhythmias, angina pectoris, and hypertension. nadolol is also used for migraine disorders and for tremor.Oxprenolol
a beta-adrenergic antagonist used in the treatment of hypertension, angina pectoris, arrhythmias, and anxiety.Penbutolol
a nonselective beta-blocker used as an antihypertensive and an antianginal agent.Pindolol
a moderately lipophilic beta blocker (adrenergic beta-antagonists). it is non-cardioselective and has intrinsic sympathomimetic actions, but little membrane-stabilizing activity. (from martindale, the extra pharmocopoeia, 30th ed, p638)Practolol
a beta-1 adrenergic antagonist that has been used in the emergency treatment of cardiac arrythmias.Propranolol
a widely used non-cardioselective beta-adrenergic antagonist. propranolol has been used for myocardial infarction; arrhythmia; angina pectoris; hypertension; hyperthyroidism; migraine; pheochromocytoma; and anxiety but adverse effects instigate replacement by newer drugs.Sotalol
an adrenergic beta-antagonist that is used in the treatment of life-threatening arrhythmias.Timolol
a beta-adrenergic antagonist that is similar in action to propranolol; the levo-isomer is more active. timolol has been proposed as an anti-hypertensive, anti-arrhythmic, anti-angina, and anti-glaucoma agent. it is also used in the treatment of migraine disorders and tremor.
Table of Drugs and ChemicalsClinical
Substances in the Table of Drugs and Chemicals that reference this code family. Always confirm in the Tabular List before coding.
Patient EducationClinical
Medication Errors
Medicines treat infectious diseases, prevent problems from chronic diseases, and ease pain. But medicines can also cause harmful reactions if not used correctly. Errors can happen in the hospital, at the health care provider's office, at the pharmacy, or at home. You can help prevent errors by:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T44.7X6A to ICD-9-CMHistory
Code HistoryHistory
Questions About T44.7X6AOverview
Is T44.7X6A (Underdosing of beta-adrenoreceptor antagonists) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report underdosing of beta-adrenoreceptor antagonists, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T44.7X6A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for underdosing of beta-adrenoreceptor antagonists, such as an emergency visit or first evaluation.
Can T44.7X6A be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because underdosing of beta-adrenoreceptor antagonists, initial encounter describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
