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MS-DRG 951 · MDC 23 · Medical

MS-DRG 951: Other Factors Influencing Health Status

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 951

FY2027 relative weight
0.5570
Higher than 1% of all MS-DRGs
Change vs FY2026
+0.2%
FY2026 weight 0.5560
Geometric mean LOS
1.8 days
Arithmetic mean 2.7 days
MDC
23
Factors Influencing Health Status and Other Contacts with Health Services
Severity level
single severity level
Transfer policy
Not a transfer DRG

TL;DR

MS-DRG 951 is a medical group in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services) at a single-severity group of its family. CMS assigns it a FY2027 relative weight of 0.5570 with a geometric mean length of stay of 1.8 days and an arithmetic mean of 2.7. Its weight moved up 0.2% from FY2026 (0.5560). That weight is higher than 1% of all medical and surgical MS-DRGs. CMS does not split this group by severity. The v44 Definitions Manual assigns it through 1436 principal diagnosis codes.

What changed from FY2026 to FY2027

CMS recalibrates every MS-DRG weight annually from the prior year's MedPAR claims. For DRG 951 the FY2027 relative weight is 0.5570 against 0.5560 in FY2026, a rise of 0.18%.

FY2026 versus FY2027 payment factors for MS-DRG 951
MetricFY2026FY2027Change
Relative weight0.55600.5570+0.0010
Geometric mean LOS (days)1.81.8+0.0
Arithmetic mean LOS (days)2.62.7+0.1
Weights shown are the FY2027 final values after the 10% cap on year-over-year reductions where applicable.

CC and MCC family

DRG 951 stands alone: CMS does not split this base group by CC or MCC severity, so complication documentation does not move the assignment, although it still affects quality and risk-adjustment reporting.

Grouper logic (v44 Definitions Manual)

Principal Diagnosis: 1436 ICD-10 codes drive assignment to this group; the first 12 are shown.

Principal Diagnosis codes assigned to DRG 951 (sample)
ICD-10 codeDescription
F17200Nicotine dependence, unspecified, uncomplicated
F17201Nicotine dependence, unspecified, in remission
F17210Nicotine dependence, cigarettes, uncomplicated
F17211Nicotine dependence, cigarettes, in remission
F17220Nicotine dependence, chewing tobacco, uncomplicated
F17221Nicotine dependence, chewing tobacco, in remission
F17290Nicotine dependence, other tobacco product, uncomplicated
F17291Nicotine dependence, other tobacco product, in remission
J95850Mechanical complication of respirator
P002Newborn affected by maternal infectious and parasitic diseases
P0082Newborn affected by (positive) maternal group B streptococcus (GBS) colonization
P0089Newborn affected by other maternal conditions

Documentation and denial exposure

As a medical DRG, assignment depends on the principal diagnosis sequenced from the attending's documentation; a secondary condition sequenced first, or a symptom code in place of the confirmed diagnosis, changes the MDC or the DRG. Because this family has no severity split, review risk concentrates on medical-necessity of the admission itself and on the two-midnight benchmark. 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 951 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 951

What is MS-DRG 951?

MS-DRG 951 is "Other Factors Influencing Health Status", a medical Medicare Severity Diagnosis-Related Group in MDC 23, Factors Influencing Health Status and Other Contacts with Health Services. 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 951?

The FY2027 relative weight is 0.5570 (IPPS final rule Table 5, effective October 1, 2026). In FY2026 it was 0.5560, a change of +0.2%.

What is the average length of stay for DRG 951?

CMS reports a geometric mean length of stay of 1.8 days and an arithmetic mean of 2.7 days for FY2027. The geometric mean is used for transfer-payment calculations.

What documentation supports the severity level of DRG 951?

DRG 951 has no CC or MCC sibling, so secondary-diagnosis capture does not change the group or its weight. Review effort belongs instead on the principal diagnosis sequencing and the procedure codes that place the stay in this group, and on medical necessity of the inpatient admission itself under the two-midnight benchmark, which is where denials for single-severity groups concentrate.

Which codes group to DRG 951?

The v44 Definitions Manual lists 1436 principal diagnosis codes for this group. Examples from the principal diagnosis list: F17200 (Nicotine dependence, unspecified, uncomplicated); F17201 (Nicotine dependence, unspecified, in remission); F17210 (Nicotine dependence, cigarettes, uncomplicated); F17211 (Nicotine dependence, cigarettes, in remission).

Is DRG 951 a post-acute transfer DRG?

No. DRG 951 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.