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MS-DRG 666 · MDC 11 · Surgical

MS-DRG 666: Prostatectomy with CC

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 666

FY2027 relative weight
1.8050
Higher than 56% of all MS-DRGs
Change vs FY2026
+3.2%
FY2026 weight 1.7490
Geometric mean LOS
3.7 days
Arithmetic mean 5.0 days
MDC
11
Assignment of Diagnosis Codes
Severity level
with CC (complication or comorbidity)
Transfer policy
Not a transfer DRG

TL;DR

MS-DRG 666 is a surgical group in MDC 11 (Assignment of Diagnosis Codes) at the middle severity level of its family. CMS assigns it a FY2027 relative weight of 1.8050 with a geometric mean length of stay of 3.7 days and an arithmetic mean of 5.0. Its weight moved up 3.2% from FY2026 (1.7490). That weight is higher than 56% of all surgical and medical MS-DRGs. Its CC/MCC family (DRG 665, DRG 667) spans weights 1.1310 to 3.2520. The v44 Definitions Manual assigns it through 18 operating room procedures codes.

What changed from FY2026 to FY2027

CMS recalibrates every MS-DRG weight annually from the prior year's MedPAR claims. For DRG 666 the FY2027 relative weight is 1.8050 against 1.7490 in FY2026, a rise of 3.20%, which exceeds the 2% threshold worth re-checking in contract models.

FY2026 versus FY2027 payment factors for MS-DRG 666
MetricFY2026FY2027Change
Relative weight1.74901.8050+0.0560
Geometric mean LOS (days)3.63.7+0.1
Arithmetic mean LOS (days)5.05.0+0.0
Weights shown are the FY2027 final values after the 10% cap on year-over-year reductions where applicable.

CC and MCC family

DRG 666 shares its base definition with 2 other MS-DRGs split by severity. The family's weights span 1.1310 to 3.2520, a 2.88× spread, which is the payment effect of documenting qualifying complications and comorbidities.

MS-DRGs in the same base group as DRG 666
DRGTitleFY2027 weightGMLOS
665Prostatectomy with MCC3.25207.7
666Prostatectomy with CC1.80503.7
667Prostatectomy without CC/MCC1.13101.9

Grouper logic (v44 Definitions Manual)

Operating Room Procedures: 18 ICD-10 codes drive assignment to this group; the first 12 are shown.

Operating Room Procedures codes assigned to DRG 666 (sample)
ICD-10 codeDescription
0V500Z3Destruction of Prostate using Laser Interstitial Thermal Therapy, Open Approach
0V500ZZDestruction of Prostate, Open Approach
0V503Z3Destruction of Prostate using Laser Interstitial Thermal Therapy, Percutaneous Approach
0V503ZZDestruction of Prostate, Percutaneous Approach
0V504Z3Destruction of Prostate using Laser Interstitial Thermal Therapy, Percutaneous Endoscopic Approach
0V504ZZDestruction of Prostate, Percutaneous Endoscopic Approach
0V507ZZDestruction of Prostate, Via Natural or Artificial Opening
0V508ZZDestruction of Prostate, Via Natural or Artificial Opening Endoscopic
0VB07ZZExcision of Prostate, Via Natural or Artificial Opening
0VB08ZZExcision of Prostate, Via Natural or Artificial Opening Endoscopic
0VT00ZEResection of Prostate, Open Approach, Capsule Intact
0VT00ZZResection of Prostate, Open Approach

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 11 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 666 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.

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Frequently asked questions — DRG 666

What is MS-DRG 666?

MS-DRG 666 is "Prostatectomy with CC", a surgical Medicare Severity Diagnosis-Related Group in MDC 11, Assignment of Diagnosis Codes. 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 666?

The FY2027 relative weight is 1.8050 (IPPS final rule Table 5, effective October 1, 2026). In FY2026 it was 1.7490, a change of +3.2%.

What is the average length of stay for DRG 666?

CMS reports a geometric mean length of stay of 3.7 days and an arithmetic mean of 5.0 days for FY2027. The geometric mean is used for transfer-payment calculations.

Which DRGs are in the same CC/MCC family as 666?

DRG 665 (Prostatectomy with MCC, weight 3.2520); DRG 667 (Prostatectomy without CC/MCC, weight 1.1310). The family's weights range from 1.1310 to 3.2520, so documented complications and comorbidities change payment materially.

What documentation supports the severity level of DRG 666?

DRG 666 is reached when the stay carries a secondary diagnosis from the CMS Complication or Comorbidity list but none from the MCC list. Common CC captures include chronic kidney disease stage 3 and above, uncontrolled diabetes with manifestations, malnutrition of specified severity and heart failure of a stated type. Each must be documented by the treating clinician and show clinical relevance in the record; a condition listed only in the problem list without assessment is the most frequent reason a CC is removed on audit and the stay drops to the base DRG.

Which codes group to DRG 666?

The v44 Definitions Manual lists 18 operating room procedures codes for this group. Examples from the operating room procedures list: 0V500Z3 (Destruction of Prostate using Laser Interstitial Thermal Therapy, Open Approach); 0V500ZZ (Destruction of Prostate, Open Approach); 0V503Z3 (Destruction of Prostate using Laser Interstitial Thermal Therapy, Percutaneous Approach); 0V503ZZ (Destruction of Prostate, Percutaneous Approach).

Is DRG 666 a post-acute transfer DRG?

No. DRG 666 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.