Skip to main content
MS-DRG 583 · MDC 09 · Surgical

MS-DRG 583: Mastectomy for Malignancy without CC/MCC

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Data effective
Data currency: IPPS Table 5 FY2027 final rule (effective October 1, 2026); Definitions Manual v44 (effective October 1, 2026). Next CMS release: April 1, 2027 (v44.1 mid-year update), then the FY2028 final rule in August 2027.

Key facts for DRG 583

FY2027 relative weight
1.8010
Higher than 56% of all MS-DRGs
Change vs FY2026
+4.5%
FY2026 weight 1.7240
Geometric mean LOS
2.1 days
Arithmetic mean 2.8 days
MDC
09
Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast
Severity level
without CC or MCC
Transfer policy
Not a transfer DRG

TL;DR

MS-DRG 583 is a surgical group in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast) at the base severity level of its family. CMS assigns it a FY2027 relative weight of 1.8010 with a geometric mean length of stay of 2.1 days and an arithmetic mean of 2.8. Its weight moved up 4.5% from FY2026 (1.7240). That weight is higher than 56% of all surgical and medical MS-DRGs. Its CC/MCC family (DRG 582) spans weights 1.8010 to 1.8010. The v44 Definitions Manual assigns it through 68 operating room procedures codes and 74 principal or secondary diagnosis codes.

What changed from FY2026 to FY2027

CMS recalibrates every MS-DRG weight annually from the prior year's MedPAR claims. For DRG 583 the FY2027 relative weight is 1.8010 against 1.7240 in FY2026, a rise of 4.47%, which exceeds the 2% threshold worth re-checking in contract models.

FY2026 versus FY2027 payment factors for MS-DRG 583
MetricFY2026FY2027Change
Relative weight1.72401.8010+0.0770
Geometric mean LOS (days)1.72.1+0.4
Arithmetic mean LOS (days)2.12.8+0.7
Weights shown are the FY2027 final values after the 10% cap on year-over-year reductions where applicable.

CC and MCC family

DRG 583 shares its base definition with 1 other MS-DRG split by severity. The family's weights span 1.8010 to 1.8010, a 1.00× spread, which is the payment effect of documenting qualifying complications and comorbidities.

MS-DRGs in the same base group as DRG 583
DRGTitleFY2027 weightGMLOS
582Mastectomy for Malignancy with CC/MCC1.80102.1
583Mastectomy for Malignancy without CC/MCC1.80102.1

Grouper logic (v44 Definitions Manual)

Operating Room Procedures: 68 ICD-10 codes drive assignment to this group; the first 12 are shown.

Operating Room Procedures codes assigned to DRG 583 (sample)
ICD-10 codeDescription
0H0V0JZAlteration of Bilateral Breast with Synthetic Substitute, Open Approach
0HBT0ZZExcision of Right Breast, Open Approach
0HBT3ZZExcision of Right Breast, Percutaneous Approach
0HBU0ZZExcision of Left Breast, Open Approach
0HBU3ZZExcision of Left Breast, Percutaneous Approach
0HBV0ZZExcision of Bilateral Breast, Open Approach
0HBV3ZZExcision of Bilateral Breast, Percutaneous Approach
0HRT075Replacement of Right Breast using Latissimus Dorsi Myocutaneous Flap, Open Approach
0HRT076Replacement of Right Breast using Transverse Rectus Abdominis Myocutaneous Flap, Open Approach
0HRT077Replacement of Right Breast using Deep Inferior Epigastric Artery Perforator Flap, Open Approach
0HRT078Replacement of Right Breast using Superficial Inferior Epigastric Artery Flap, Open Approach
0HRT079Replacement of Right Breast using Gluteal Artery Perforator Flap, Open Approach

Principal Or Secondary Diagnosis: 74 ICD-10 codes drive assignment to this group; the first 12 are shown.

Principal Or Secondary Diagnosis codes assigned to DRG 583 (sample)
ICD-10 codeDescription
C50011Malignant neoplasm of nipple and areola, right female breast
C50012Malignant neoplasm of nipple and areola, left female breast
C50019Malignant neoplasm of nipple and areola, unspecified female breast
C50021Malignant neoplasm of nipple and areola, right male breast
C50022Malignant neoplasm of nipple and areola, left male breast
C50029Malignant neoplasm of nipple and areola, unspecified male breast
C50111Malignant neoplasm of central portion of right female breast
C50112Malignant neoplasm of central portion of left female breast
C50119Malignant neoplasm of central portion of unspecified female breast
C50121Malignant neoplasm of central portion of right male breast
C50122Malignant neoplasm of central portion of left male breast
C50129Malignant neoplasm of central portion of unspecified male breast

Documentation and denial exposure

As a surgical DRG, assignment depends on a qualifying operating-room procedure being coded from the operative report; a missing or non-OR procedure code drops the stay into a medical DRG in MDC 09 with a lower weight. Because this family splits by severity, auditors target CC and MCC capture: each secondary diagnosis must be documented as present, monitored, evaluated or treated during the stay to survive a DRG-validation review. Typical inpatient denial codes for this group: CARC 16 (claim lacks information needed to group the stay), CARC 50 (the admission or procedure is judged not medically necessary), CARC 97 (a service is bundled into the DRG payment).

How QuickIntell uses DRG 583 data

QuickCode groups inpatient encounters against the current v44 logic, flags CC and MCC candidates that lack supporting documentation, and shows the weight difference across the family before the claim drops. QuickScribe captures the attending's language that supports severity, and QuickRCM works DRG-validation denials with the grouper evidence attached.

Explore QuickCodeExplore QuickScribeBook a demo

Frequently asked questions — DRG 583

What is MS-DRG 583?

MS-DRG 583 is "Mastectomy for Malignancy without CC/MCC", a surgical Medicare Severity Diagnosis-Related Group in MDC 09, Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast. Medicare pays inpatient stays grouped here at the hospital's base rate multiplied by the DRG relative weight.

What is the FY2027 relative weight for DRG 583?

The FY2027 relative weight is 1.8010 (IPPS final rule Table 5, effective October 1, 2026). In FY2026 it was 1.7240, a change of +4.5%.

What is the average length of stay for DRG 583?

CMS reports a geometric mean length of stay of 2.1 days and an arithmetic mean of 2.8 days for FY2027. The geometric mean is used for transfer-payment calculations.

Which DRGs are in the same CC/MCC family as 583?

DRG 582 (Mastectomy for Malignancy with CC/MCC, weight 1.8010). The family's weights range from 1.8010 to 1.8010, so documented complications and comorbidities change payment materially.

What documentation supports the severity level of DRG 583?

DRG 583 is the base-severity assignment: no secondary diagnosis on the CC or MCC lists was coded, or the only ones present are excluded for this principal diagnosis. Revenue-integrity review here looks for undercapture, meaning conditions treated during the stay (electrolyte disorders, specified anemia, acute blood loss, pressure injuries present on admission) that were never documented to the specificity the lists require. A compliant query to the attending, not a coder assumption, is the only way to move a stay to the CC or MCC sibling.

Which codes group to DRG 583?

The v44 Definitions Manual lists 68 operating room procedures codes and 74 principal or secondary diagnosis codes for this group. Examples from the operating room procedures list: 0H0V0JZ (Alteration of Bilateral Breast with Synthetic Substitute, Open Approach); 0HBT0ZZ (Excision of Right Breast, Open Approach); 0HBT3ZZ (Excision of Right Breast, Percutaneous Approach); 0HBU0ZZ (Excision of Left Breast, Open Approach).

Is DRG 583 a post-acute transfer DRG?

No. DRG 583 is not on the FY2027 post-acute care transfer list, so the transfer per-diem policy does not apply to it.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-01. Verify against the primary file before billing or contracting decisions.

Disclaimer

This page is an operational reference compiled from the CMS IPPS FY2027 final rule (Table 5) and the v44 ICD-10 MS-DRG Definitions Manual. Relative weights are national factors; actual payment depends on each hospital's wage-adjusted base rate, add-ons, outliers and transfer adjustments. Nothing here is legal, clinical or billing advice; verify grouping against your encoder and the published CMS files.