Increase in number of pressure ulcers

Number of home health episodes where [(a) the value recorded for the total number of stageable pressure ulcers [(M0462 – number at stage 1) + (M0452 - number at stage 2) + (M0452 - number at stage 3) + (M0452 number at stage 4) or (b) "0" if M0448=0 and M0462=0] on the discharge assessment is numerically greater than the value resulting from the same calculation using the responses on the start (or resumption) of care assessment - indicating an increase in the number of pressure ulcers

OASIS C items:

(M0448) Does this patient have at least one unhealed (non-epithelialized) Pressure Ulcer at Stage II or higher or designated as "not stageable"?
0- No 
1- Yes

(M0452) Current Number of Unhealed (non-epithelialized) Pressure Ulcers at Each Stage: 
(Enter “0” if none; enter “4” if “4 or more”; enter “UK” for rows d.1 – d.3 if “Unknown”)

a. Stage II: Partial thickness loss of dermis presenting as a shallow open ulcer with red pink wound bed, without slough. May also present as an intact or open/ruptured serum-filled blister. 
b. Stage III: Full thickness tissue loss. Subcutaneous fat may be visible but bone, tendon, or muscles are not exposed. Slough may be present but does not obscure the depth of tissue loss. May include undermining and tunneling. 
c. Stage IV: Full thickness tissue loss with visible bone, tendon, or muscle. Slough or eschar may be present on some parts of the wound bed. Often includes undermining and tunneling. 
d.1 Unstageable: Known or likely but not stageable due to non-removable dressing or device 
d.2 Unstageable: Known or likely but not stageable due to coverage of wound bed by slough and/or eschar. 
d.3 Unstageable: Suspected deep tissue injury in evolution.

(M0462) Current Number of Stage I Pressure Ulcers: Intact skin with non-blanchable redness of a localized area usually over a bony prominence. The area may be painful, firm, soft, warmer or cooler as compared to adjacent tissue.
0,1, 2, 3, 4 or more