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ICD-10/M1A.19X1

M1A.19X1 ICD-10-CM Code: Lead-induced chronic gout, multiple sites, with tophus (tophi)

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 917 — POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC (MDC 21)
  • MS-DRG 918 — POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC (MDC 21)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Lead-induced chronic gout, multiple sites, with tophus (tophi) is a billable ICD-10-CM diagnosis code (M1A.191).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for M1A.19X1 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Code First

Underlying conditions that must be sequenced before this code.

  • toxic effects of lead and its compounds (T56.0-)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify:
  • Autonomic neuropathy in diseases classified elsewhere (G99.0)
  • Calculus of urinary tract in diseases classified elsewhere (N22)
  • Cardiomyopathy in diseases classified elsewhere (I43)
  • Disorders of external ear in diseases classified elsewhere (H61.1-, H62.8-)
  • Disorders of iris and ciliary body in diseases classified elsewhere (H22)
  • Glomerular disorders in diseases classified elsewhere (N08)

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • Billable — reportable as written.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of M1A.19X1 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • M00-M99 — Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) (M00-M99) [Hierarchy]

Referenced by Excludes1 notes

  • E72 — Other disorders of amino-acid metabolism [Excludes1](via M1A.-): “gout (M1A.-, M10.-)”
  • E79 — Disorders of purine and pyrimidine metabolism [Excludes1](via M1A.-): “gout (M1A.-, M10.-)”

Referenced by Excludes2 notes

  • H61.1 — Noninfective disorders of pinna [Excludes2](via M1A.-): “gouty tophi of ear (M1A.-)”
  • M10 — Gout [Excludes2](via M1A.-): “chronic gout (M1A.-)”

Referenced by Code First instructions

  • G99.0 — Autonomic neuropathy in diseases classified elsewhere [Code First](via M1A.-): “gout (M1A.-, M10.-)”
  • H22 — Disorders of iris and ciliary body in diseases classified elsewhere [Code First](via M1A.-): “gout (M1A.-, M10.-)”
  • H62.8 — Other disorders of external ear in diseases classified elsewhere [Code First](via M1A.-): “gout (M1A.-, M10.-)”
  • N08 — Glomerular disorders in diseases classified elsewhere [Code First](via M1A.-): “gout (M1A.-, M10.-)”
  • N22 — Calculus of urinary tract in diseases classified elsewhere [Code First](via M1A.-): “gout (M1A.-, M10.-)”

Clinical classification (CCSR)

Potential MS-DRG

  • DRG 917 — POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC [MS-DRG]: “POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC (MDC 21)”
  • DRG 918 — POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC [MS-DRG]: “POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC (MDC 21)”

Nearest codes (40)

  • M1A — Chronic gout [Sibling]
  • M1A.1620 — Lead-induced chronic gout, left knee, without tophus (tophi) [Sibling]
  • M1A.1621 — Lead-induced chronic gout, left knee, with tophus (tophi) [Sibling]
  • M1A.169 — Lead-induced chronic gout, unspecified knee [Sibling]
  • M1A.1690 — Lead-induced chronic gout, unspecified knee, without tophus (tophi) [Sibling]
  • M1A.1691 — Lead-induced chronic gout, unspecified knee, with tophus (tophi) [Sibling]
  • M1A.17 — Lead-induced chronic gout, ankle and foot [Sibling]
  • M1A.171 — Lead-induced chronic gout, right ankle and foot [Sibling]
  • and 32 more

Referenced by Other Codes

Clinical classification (AHRQ CCSR):MUS033 — Gout (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 917 (MDC 21), DRG 918 (MDC 21).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Official ICD-10-CM tabular notes on other codes that name M1A.19X1 or its code family.

2 Excludes1 notes: E72 (via M1A.-), E79 (via M1A.-).

2 Excludes2 notes across 2 chapters: H61.1 (via M1A.-), M10 (via M1A.-).

5 Code First instructions across 4 chapters: G99.0 (via M1A.-), H22 (via M1A.-), H62.8 (via M1A.-), N08 (via M1A.-), N22 (via M1A.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Does M1A.19X1 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category M1A.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M1A.19X1 in its code family, with their registry titles.

  • M1A.18 — Lead-induced chronic gout, vertebrae
  • M1A.18X0 — Lead-induced chronic gout, vertebrae, without tophus (tophi)
  • M1A.18X1 — Lead-induced chronic gout, vertebrae, with tophus (tophi)
  • M1A.19 — Lead-induced chronic gout, multiple sites
  • M1A.19X0 — Lead-induced chronic gout, multiple sites, without tophus (tophi)
  • M1A.2 — Drug-induced chronic gout
  • M1A.20 — Drug-induced chronic gout, unspecified site
  • M1A.20X0 — Drug-induced chronic gout, unspecified site, without tophus (tophi)
  • M1A.20X1 — Drug-induced chronic gout, unspecified site, with tophus (tophi)
  • M1A.21 — Drug-induced chronic gout, shoulder

View all codes in the M1A family