2027 ICD-10-CM Diagnosis Code A19.1Acute miliary tuberculosis of multiple sites

ICD-10-CM Codes›A00–B99›A15-A19›A19

ICD-10-CM A19.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A19.1 is a billable ICD-10-CM diagnosis code for acute miliary tuberculosis of multiple sites. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869, 974 through 976. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 19 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tuberculosis.

Code Identity

ICD-10-CM Code
A19.1
Billable Status
Yes — Valid for Submission
Code Describes
Acute miliary tuberculosis of multiple sites
Short Description
Acute miliary tuberculosis of multiple sites
Same as the full description in the CMS dataset.
Parent Code
A19
Miliary tuberculosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA15-A19Tuberculosis
CategoryA19Miliary tuberculosis
This CodeA19.1Acute miliary tuberculosis of multiple sites

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A19.1: its own notes plus those printed at A19, block A15-A19, and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From A19 Miliary tuberculosis applies to 5 codes
  • disseminated tuberculosis
  • generalized tuberculosis
  • tuberculous polyserositis
From Block A15-A19 Tuberculosis applies to 51 codes
  • infections due to Mycobacterium tuberculosis and Mycobacterium bovis
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block A15-A19 Tuberculosis applies to 51 codes
  • congenital tuberculosis (P37.0)
  • nonspecific reaction to test for tuberculosis without active tuberculosis (R76.1-)
  • pneumoconiosis associated with tuberculosis, any type in A15 (J65)
  • positive PPD (R76.11)
  • positive tuberculin skin test without active tuberculosis (R76.11)
  • sequelae of tuberculosis (B90.-)
  • silicotuberculosis (J65)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block A15-A19 Tuberculosis applies to 51 codes
  • code, if applicable, for associated cachexia (E88.A)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A19.1, its category, or a range that includes it.

Applicable To 1

These notes mention A19.1.

  • O98.0 Tuberculosis complicating pregnancy, childbirth and the puerperium
    Conditions in A15-A19 names A15-A19, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming A19.1: its condition is not part of those codes, and both may be reported when the patient has both.

  • A31 Infection due to other mycobacteria
    tuberculosis (A15-A19) names A15-A19, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF001
Tuberculosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Tuberculosis, Miliary

    an acute form of tuberculosis in which minute tubercles are formed in a number of organs of the body due to dissemination of the bacilli through the blood stream..

Patient EducationClinical

Tuberculosis

Tuberculosis (TB) is a bacterial disease that usually attacks the lungs. But it can also attack other parts of the body, including the kidneys, spine, and brain.

The full article covers:

  • What is tuberculosis (TB)?
  • What causes tuberculosis (TB)?
  • Who is more likely to get infected with tuberculosis (TB) germs?
  • Who is more likely to develop TB disease?
  • What are the symptoms of tuberculosis (TB)?
  • How is tuberculosis (TB) diagnosed?
  • What is the treatment for tuberculosis (TB)?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A19.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
018.00 Acute miliary tb-unspec
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A19.1Overview

What is the ICD-10 code for acute miliary tuberculosis of multiple sites?

The ICD-10-CM code for acute miliary tuberculosis of multiple sites is A19.1 (sometimes written as A191). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A19.1 (Miliary tuberculosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute miliary tuberculosis of multiple sites on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A19.1 group to?

When acute miliary tuberculosis of multiple sites is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 975, 867, 869, 868, with relative weights from 0.6784 to 3.0488 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A19.1 a CC or MCC?

CMS lists A19.1 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 19 closely related codes in its exclusion list.

Can A19.1 be reported with P37.0?

Not as a rule. The Excludes1 note at block A15-A19, which applies to A19.1, lists "congenital tuberculosis (P37.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).