ICD-10 A19.1
Billable / Specific MCCAcute miliary tuberculosis of multiple sites
About ICD-10-CM A19.1
ICD-10-CM code A19.1 represents Acute miliary tuberculosis of multiple sites. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A19). The 2026 edition of ICD-10-CM A19.1 became effective on October 1, 2025.
Coding Tips for A19.1
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A19.1 is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inpatient DRG Impact, MCC
codes Acute miliary tuberculosis of multiple sites. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for A19.1
Local Coverage Determinations (LCDs) from CMS MACs that list A19.1 as a covered diagnosis.
Showing top 10 of 62 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A19.1.
1 Cigna
5 Medicare
CPT Codes Commonly Billed with A19.1
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 82306 CMS LCD: Billing and Coding: Vitamin D; 25 hydroxy, includes fraction(s), if performed CMS LCD
- 94680 CMS LCD: Billing and Coding: Respiratory Care CMS LCD
- 94690 CMS LCD: Billing and Coding: Respiratory Care CMS LCD
- 94681 CMS LCD: Billing and Coding: Respiratory Care CMS LCD
- 82379 CMS LCD: Billing and Coding: Assays for Vitamins and Metabolic Function CMS LCD
- 86352 CMS LCD: Billing and Coding: Assays for Vitamins and Metabolic Function CMS LCD
- 82652 CMS LCD: Billing and Coding: Assays for Vitamins and Metabolic Function CMS LCD
- 84207 CMS LCD: Billing and Coding: Assays for Vitamins and Metabolic Function CMS LCD
- 85385 CMS LCD: Billing and Coding: Assays for Vitamins and Metabolic Function CMS LCD
- 82746 CMS LCD: Billing and Coding: Assays for Vitamins and Metabolic Function CMS LCD
Convert A19.1 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| A19.1 | 01800 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A19.1
Other codes in section A15-A19 (Tuberculosis).
ICD-10 A19.1, Billing FAQ
Is ICD-10 code A19.1 billable? +
Yes, A19.1 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Is A19.1 a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with A19.1? +
Procedures frequently paired with A19.1 include: 82306, 94680, 94690, 94681, 82379.
What ICD-9 codes does A19.1 map to? +
Per CMS GEMs, A19.1 maps to ICD-9 codes: 01800. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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